Honey Bee
- NOTOC**
Honey Bees: Colony Health, Threats, Ecology, and Conservation
Honey bees, particularly the western honey bee Apis mellifera, are among the world's most intensively studied insects because of their ecological importance, complex social organization, production of honey and other hive products, and widespread use in agricultural pollination. Research on honey bees increasingly shows that their health cannot be understood through a single threat. Colony survival emerges from interactions among parasites, viruses, nutrition, pesticides, weather, genetics, queen quality, microbial communities, landscape conditions, and beekeeping practices.
Concern about honey bee losses became especially prominent during investigations of Colony Collapse Disorder in the 2000s. Research associated with those losses helped shift scientific attention toward combinations of stressors rather than a single universal cause. Modern surveillance programs continue to document colony numbers, mortality, pests, diseases, and other health indicators, while researchers investigate why losses vary among regions, seasons, and types of beekeeping operations.
Colony Losses and Honey Bee Health
Managed honey bee colonies routinely experience mortality, but the severity of losses varies considerably between years, regions, climates, and management systems. Surveys in the United States and other countries have documented substantial winter, summer, and annual losses. Studies in Africa, Asia, Europe, and North America demonstrate that the causes and circumstances of colony decline can differ markedly between locations.
Among commercial and managed colonies, the parasitic mite Varroa destructor remains one of the most consistently identified health pressures. Colony-loss research also implicates viral diseases, nutrition, weather, pesticide exposure, queen problems, and management practices. In some regions, drought, wildfire, absconding, theft, inadequate water, and other locally important factors contribute to losses.
The accumulated evidence therefore supports a multi-stressor model of honey bee health. A colony already weakened by poor nutrition, for example, may be less capable of tolerating viral infection or pesticide exposure. Weather can alter forage availability, brood production, parasite reproduction, and the amount of food required for overwintering. Management decisions can either lessen or intensify these pressures.
Varroa Mites and Emerging Parasites
Varroa destructor is one of the most consequential parasites of managed western honey bees. The mites reproduce within capped brood cells and feed on developing and adult bees. Their importance extends beyond the direct damage caused by parasitism because Varroa mites transmit and amplify several viruses.
Deformed wing virus is particularly associated with Varroa infestation. Research has documented changes in honey bee virus communities following the global spread of the mite, helping explain why Varroa invasion can transform disease dynamics within bee populations.
Control has become increasingly complicated by resistance to miticides. Amitraz has been widely used against Varroa, but resistant mite populations have emerged. Researchers are investigating genetic mechanisms of resistance, improved treatment timing, combinations of chemical and nonchemical treatments, brood interruption, heat treatments, RNA interference, and compounds capable of restoring or increasing the effectiveness of existing miticides.
Selective breeding offers another strategy. Some honey bee populations exhibit hygienic behavior, recapping of brood cells, reduced mite reproduction, mite biting, or other traits associated with greater Varroa tolerance or resistance. Studies of feral and selectively bred populations suggest that genetic and behavioral resistance could become an increasingly important component of integrated mite management.
Another concern is Tropilaelaps, a group of parasitic mites capable of reproducing rapidly in honey bee brood and transmitting viruses. Research and surveillance programs increasingly treat the potential geographic expansion of these mites as an important biosecurity issue.
Viruses, Bacteria, and Disease
Honey bee colonies host diverse viral communities. Some infections remain relatively inconspicuous, while others can become serious when combined with parasites, nutritional stress, pesticides, or other pressures.
Deformed wing virus has received particular attention because of its association with Varroa mites. Different viral genotypes have changed in prevalence as Varroa has spread, illustrating how an invasive parasite can reshape pathogen populations.
Honey bees are also affected by bacterial diseases such as American foulbrood, caused by Paenibacillus larvae, as well as fungal, microsporidian, and other infections. Research includes improved detection methods, biological controls, hygienic breeding, and management strategies intended to reduce disease transmission.
Queens can also harbor pathogens. Because the queen provides most of a colony's reproductive output, impaired queen health can have colony-wide consequences. Studies therefore increasingly examine infection, immunity, nutrition, reproductive physiology, and queen longevity together.
Nutrition, Pollen, and the Foraging Landscape
Honey bee nutrition depends heavily on access to diverse floral resources. Nectar primarily supplies carbohydrates, while pollen provides proteins, amino acids, lipids, sterols, vitamins, minerals, and other compounds required for development and physiological function.
Not all pollen is nutritionally equivalent. Research shows substantial differences among plant species in pollen chemistry and nutritional value. Honey bees consequently forage across multiple plant species, including when colonies are placed in large agricultural monocultures.
Landscape diversity can therefore influence colony nutrition. Studies of bees deployed for crop pollination have shown that surrounding non-crop vegetation can provide important supplemental pollen. Cover crops, native plants, flowering field margins, gardens, and other floral resources may help extend the availability and diversity of forage.
Scientists are also developing improved supplemental feeds. Research has explored microalgae, probiotics, engineered yeast containing essential pollen sterols, artificial protein diets, and precision nutrition based on honey bee physiology and gene expression. These approaches could be useful when natural pollen is scarce, although natural pollen contains complex nutritional and protective compounds that may be difficult to reproduce completely in artificial diets.
Climate Change and Overwintering
Climate affects honey bees both directly and indirectly. Temperature influences metabolism, brood production, parasite reproduction, flowering periods, forage availability, and winter energy consumption. Drought can reduce floral abundance and water availability, while extreme temperatures can increase physiological stress.
Warmer autumns and winters do not necessarily benefit honey bees. Colonies may remain more active and consume additional stored food, while prolonged brood production can provide Varroa mites with additional opportunities to reproduce. Research has linked seasonal weather conditions with subsequent winter survival.
Climate change may also alter the diversity and geographic distribution of plants used by honey bees. Changes in rainfall, temperature, drought, and flowering schedules can modify the quantity, quality, and timing of nectar and pollen.
Honey bee populations are not identical in their responses. Regional subspecies and locally adapted populations may possess behavioral, physiological, or genetic traits suited to particular environmental conditions. Preserving this diversity may therefore contribute to long-term resilience.
Pesticides and Environmental Contaminants
Honey bees encounter agricultural and environmental chemicals through pollen, nectar, water, dust, wax, and other materials. Pesticides can also accumulate within hive products and comb.
Research demonstrates that pesticide effects extend beyond immediate mortality. Sublethal exposure can influence movement, learning, memory, odor perception, flight, immune responses, metabolism, gut microorganisms, gene expression, and other physiological processes.
Chemical mixtures are particularly important. Honey bees in real agricultural landscapes may encounter insecticides, fungicides, herbicides, miticides, and spray additives simultaneously or sequentially. Some combinations can produce stronger effects than would be predicted from studying each compound separately.
Interactions with other stresses also matter. Varroa parasitism, viral infection, temperature extremes, and poor nutrition can modify pesticide sensitivity. Conversely, pesticide exposure may affect immune or microbial systems that help bees cope with pathogens.
Research has even shown that pesticide burdens can move through the social organization of a colony. Workers can initially buffer queens from some contaminants, but prolonged exposure may eventually result in chemicals reaching queens and developing eggs.
These findings have encouraged pesticide regulators to consider exposure timing, flowering crops, bee activity, application methods, mixture effects, and improved pollinator-risk assessments.
Queens, Genetics, and Breeding
Queen quality is central to colony productivity and persistence. Queen development depends on larval nutrition and social conditions, while adult reproductive performance can be influenced by disease, pesticides, genetics, seasonal conditions, sperm viability, and nutritional stress.
Beekeepers and researchers have developed techniques including controlled breeding, instrumental insemination, indoor queen storage, and selective propagation of desirable stocks.
Genetic diversity is particularly important because honey bee populations differ in disease susceptibility, defensive behavior, climatic adaptation, productivity, and resistance to Varroa. Studies have examined European, African, Africanized, and hybrid populations, as well as differences among commercially maintained stocks.
Selective breeding for hygienic behavior and mite resistance is one promising direction. However, maintaining broad genetic diversity remains important because concentrating heavily on a narrow range of breeding lines can potentially reduce the adaptive options available to future populations.
The Honey Bee Microbiome and Immunity
Honey bees contain specialized communities of microorganisms, particularly within their digestive systems. These microbial communities contribute to digestion, metabolism, immune function, nutrient processing, and resistance to some pathogens.
Diet, age, task, geography, season, disease, antibiotics, pesticides, and environmental conditions can alter the microbiome. Queens, hive workers, and foragers can possess different microbial communities, reflecting differences in diet, physiology, and behavior.
Researchers are investigating whether probiotics or naturally occurring beneficial bacteria could strengthen colony health. Some experiments have reported improved brood production, food storage, immunity, or pathogen resistance after microbial supplementation, although probiotic effectiveness can depend on the bacterial strain and method of delivery.
The microbiome also illustrates why honey bee health is highly interconnected. A pesticide may change gut microbial communities; nutrition can influence those microbes; parasites can affect immunity; and microbial changes can in turn influence disease susceptibility.
Behavior, Communication, and Social Immunity
Honey bee colonies function through sophisticated collective behavior. Workers divide labor among brood care, food processing, nest maintenance, guarding, foraging, and other activities.
The waggle dance is one of the best-known examples of honey bee communication. Foragers communicate information about profitable food locations, helping nestmates concentrate their activity in productive areas. Research using radar, automated tracking, and behavioral experiments has refined understanding of how bees interpret and use these signals.
Young bees also learn aspects of communication socially. Experiments have shown that inexperienced bees deprived of opportunities to observe older dancers perform less accurate waggle dances.
Colonies also possess forms of social immunity. Workers can detect and remove diseased or compromised brood through hygienic behavior. Chemical signals produced by unhealthy or dead brood can trigger removal, limiting the spread of pathogens and parasites.
Modern technology is expanding the ability to study these behaviors. Deep learning, computer vision, robotic monitoring, automated tracking, genomic tools, and sensors can follow individual bees and queens for long periods and identify behavioral changes that would be difficult to observe manually.
Pollination and Ecological Effects
Managed honey bees are widely transported and maintained for agricultural pollination. Their ability to form large colonies and recruit thousands of workers to concentrated floral resources makes them particularly useful for crops requiring insect pollination.
Insufficient animal pollination can affect both crop yield and food quality. Beekeepers therefore provide an ecosystem service that has become integrated into large-scale agricultural production.
Honey bees, however, are only one component of diverse pollinator communities. Managed honey bees and wild pollinators can share floral resources, and their ecological interactions vary by habitat, plant species, bee density, season, and landscape.
Research has found positive, neutral, and negative ecological effects. Honey bees may effectively pollinate some plants while contributing little to others. In certain cases they can remove pollen without efficiently depositing it. High concentrations of managed colonies can also alter plant-pollinator networks or overlap with the forage used by wild bees.
Protecting pollinators therefore requires more than simply increasing the number of honey bee colonies. Habitat conservation, floral diversity, pesticide reduction, and protection of native pollinator communities are complementary conservation goals.
Feral Honey Bees and Population Diversity
Not all honey bees live in managed hives. Free-living or feral colonies occur in many regions and may represent an important but undercounted component of honey bee populations.
Feral colonies are scientifically valuable because populations surviving without intensive beekeeper intervention can provide information about natural selection, disease tolerance, nesting ecology, and Varroa resistance. Some populations appear capable of persisting with mite levels or management conditions that would threaten typical commercial colonies.
Wild and managed populations also exchange genes. Understanding their distribution and genetic structure may help researchers determine how domestication, commercial breeding, hybridization, and natural selection are shaping honey bee populations.
Surveillance, Management, and the Future of Beekeeping
Modern honey bee management increasingly relies on surveillance and integrated pest management. Monitoring colony strength, Varroa populations, queen condition, food stores, disease symptoms, weather, and forage availability allows beekeepers to intervene before problems become severe.
Varroa management is particularly dependent on timing. Treatments applied at appropriate points in the colony and mite reproductive cycles can produce substantially different outcomes from poorly timed interventions. Because miticide resistance is increasing, long-term strategies are likely to require rotation of effective treatments, nonchemical methods, monitoring, and resistant bee stocks rather than dependence on a single chemical.
National surveillance systems are also important for identifying emerging pests and diseases. Monitoring for threats such as Tropilaelaps may allow earlier intervention before an introduced parasite becomes widely established.
Research increasingly combines traditional beekeeping knowledge with genomics, microbiology, automated monitoring, environmental chemistry, nutritional science, and ecological modeling. These approaches are moving honey bee management away from single-factor explanations toward a systems-level understanding of colony health.
Conclusion
Honey bee research demonstrates that colony health is the product of a complex biological and environmental system. Varroa mites and the viruses associated with them remain among the most serious threats to managed colonies, particularly as resistance to commonly used miticides develops. Yet parasite control alone cannot ensure healthy bees.
Nutrition, floral diversity, pesticides, weather, climate, queen quality, genetic diversity, microbial communities, disease, and management all influence colony performance. Many of these factors interact, sometimes making a moderate stress much more damaging when combined with another.
Future honey bee conservation and management will therefore depend on integrated approaches: controlling parasites while slowing resistance, breeding resilient but genetically diverse bees, maintaining nutritious landscapes, reducing hazardous chemical exposure, monitoring emerging diseases, improving queen and colony management, and adapting beekeeping practices to changing climates.
At the same time, honey bee protection should be placed within the broader conservation of pollinators. Managed honey bees provide enormous agricultural and scientific value, but healthy ecosystems also depend on diverse wild bees and other pollinating animals. Protecting habitat and floral resources can support both managed colonies and the larger ecological networks in which they live.
- TOC**
Honey Bee — Colony Health, Losses, Surveillance, and Beekeeping Management
| Freweini Assefa et al. | Journal of Apicultural Research | 2026-02-13
Examines colony-loss rates and management-related risk factors in Cameroon, Ethiopia, and Kenya during the 2023–2024 active beekeeping season.
Pollinator Declines | Penn State Extension | Pennsylvania State University | 2025-08-24
Summarizes long-term honey bee and native-pollinator concerns and discusses poor nutrition, parasites, pathogens, pesticides, and genetics as interacting pressures.
Honey Bee Colonies 08/01/2025 | USDA National Agricultural Statistics Service | USDA | 2025-08-01
National statistics document colony inventories, losses, renovations, and health stressors, with Varroa mites remaining the most frequently reported stressor among larger U.S. beekeeping operations.
National Honey Bee Surveys | USDA APHIS | Animal and Plant Health Inspection Service | 2025-07-07
Explains the U.S. surveillance program used to track honey bee pests and diseases and to watch for exotic threats such as Tropilaelaps mites.
USDA researchers linked severe recent colony losses with high levels of deformed wing viruses and acute bee paralysis virus, alongside evidence that Varroa mites are developing resistance to the widely used miticide amitraz.
| Beatrice T. Nganso et al. | PLOS One | 2025-05-19
Surveys 1,786 beekeepers in nine Sub-Saharan African countries and examines colony losses associated with drought, fire, theft, absconding, pests, and management.
Describes investigations into unusually severe U.S. commercial honey bee losses and efforts to analyze bees, pathogens, pesticides, and other possible causes.
| Fabrice Requier et al. | Journal of Environmental Management | 2025-02
Finds that climate conditions influence colony decreases in Kenya and indicates that management practices such as supplemental water can mitigate some climatic stress.
Honey Bee Surveys and Reports | USDA National Agricultural Statistics Service | USDA | 2025
Central resource for U.S. statistics on honey production, colony numbers and losses, health stressors, and the cost of crop-pollination services.
Explores the particularly damaging relationship among honey bees, parasitic Varroa mites, and the RNA viruses the mites transmit and amplify.
Introduces an open-access research collection covering honey bee genomics, immunity, toxicology, nutrition, behavior, physiology, parasites, and population ecology.
Uses thousands of Pennsylvania beekeeper records to show that effective Varroa management can improve winter survival across differing weather conditions.
Reviews an episode of substantial managed-colony losses and examines Varroa destructor, pathogens, and other interacting pressures as possible drivers.
| Apiary Inspectors of America | Apiary Inspectors of America | 2024
Reports U.S. managed honey bee colony-loss estimates for the 2023–2024 season and compares losses among backyard, sideline, and commercial beekeeping operations.
| Nathalie Steinhauer et al. | Journal of Apicultural Research | 2023-10-16
Presents national U.S. colony-loss survey results for the 2020–2021 and 2021–2022 beekeeping seasons and examines variation among operation sizes.
| Nathalie Steinhauer et al. | Journal of Apicultural Research | 2023-01-05
Summarizes U.S. colony losses during 2017–2018, 2018–2019, and 2019–2020 and documents differences between summer, winter, and annual mortality.
| Chinese Honey Bee Colony Loss Survey Researchers | Insects | 2023
Analyzes more than a decade of winter colony-loss surveys across China and compares losses between Apis mellifera and Apis cerana.
| Fiona Kahane et al. | Ambio | 2022-05-19
Examines the motivations behind different honey bee management philosophies among United Kingdom beekeepers, including conventional and more natural approaches.
Reports New York monitoring that found widespread Varroa infestation and deformed wing virus in managed colonies.
| Jeffrey W. Harris et al. | Mississippi State University Extension | n.d.
Provides a detailed integrated-pest-management guide covering Varroa biology, sampling, treatment thresholds, brood manipulation, miticides, and resistance management.
Honey Bee — Varroa, Mites, Viruses, Bacteria, and Other Diseases
Tests an RNA-interference approach aimed at weakening pesticide-defense mechanisms in Varroa mites and restoring the effectiveness of miticide treatment.
Examines a Southern California hybrid honey bee population that displays naturally occurring resistance mechanisms against Varroa reproduction.
Describes research showing how a synergistic compound can increase amitraz toxicity to resistant Varroa mites while highlighting the need for bee-safe formulations.
Reviews the expanding threat posed by Tropilaelaps mercedesae, a rapidly reproducing mite capable of damaging brood and transmitting viruses.
Tests hygienic behavior and resistance to American foulbrood in Cape honey bee colonies.
Evaluates chemical and heat-based approaches for controlling two important parasitic mite groups affecting managed honey bees.
Compares artificial protein formulations and investigates how diet composition influences nutritional biomarkers and deformed wing virus levels.
Examines how viral challenge and seasonal conditions affect proteins, lipids, metabolites, and immune-related components in queen-laid eggs.
Reports that adherence to recommended Varroa treatment windows was associated with substantially better colony survival across thousands of beekeeper records.
Reviews important honey bee viruses, clinical signs, Varroa-mediated transmission, and colony-management practices that can reduce disease pressure.
| Rogan Tokach et al. | Scientific Reports | 2024-10-27
Tests combinations of brood interruption and chemical treatments for managing Tropilaelaps mercedesae, an increasingly important parasitic mite of western honey bees.
Provides baseline metagenomic information on viruses circulating in honey bee populations in Uzbekistan.
Tracks Varroa and viral infections after the mite's arrival on Réunion Island, documenting severe mortality in colonies with continuous tropical brood production.
Assesses Varroa and pesticide exposure in an intensive corn-and-soybean landscape and compares their relative contributions to colony outcomes.
Compares Varroa-resistant honey bee stocks with conventional commercial bees to evaluate health and economic consequences for beekeeping operations.
Uses microbiome sequencing to characterize Apis mellifera filamentous virus and other microorganisms associated with Hungarian honey bees.
Shows that Varroa mites feed differently depending on whether they are parasitizing adult bees or developing brood, refining understanding of mite biology.
| Brandon Mukogawa and James C. Nieh | Scientific Reports | 2024-01-11
Compares feral scutellata-hybrid and managed Italian honey bees in Southern California, finding differences in Varroa infestation and hygienic behavior that may help explain survival without intensive mite treatment.
Examines how the global spread of Varroa altered honey bee virus communities and favored particular viral strains associated with mite transmission.
Tracks queen microbiota, gene expression, and pathogen prevalence through seasonal changes to better understand queen health and overwintering.
Investigates how exposing honey bee queens to deformed wing virus-A affects queen infection, juvenile infection, and subsequent colony-strength measurements.
| Eugene V. Ryabov et al. | Viruses | 2023-07-21
Describes Apis mellifera solinvivirus-1, a previously overlooked RNA virus found in U.S. apiaries and detectable retrospectively in samples collected more than a decade earlier.
| Shahin Nekoei et al. | Veterinary Medicine and Science | 2023-06-19
Systematically reviews important honey bee infections and available treatment or management options for bacterial, fungal, viral, and parasitic diseases.
Confirms an association between the Y215H mutation in the Varroa beta-2 octopamine receptor and contemporary cases of amitraz resistance in U.S. mite populations.
| Bin Zhou et al. | Journal of Insect Science | 2023-03-22
Reviews and investigates beneficial bacteria as potential biological-control tools against American foulbrood caused by Paenibacillus larvae.
| Hannah J. Penn et al. | Frontiers in Genetics | 2022-06-03
Finds that honey bee genetic stock influences the severity of deformed wing virus symptoms even when viral load and dissemination are not substantially different.
| Philip J. Lester et al. | Scientific Reports | 2022-05-25
Characterizes viral communities in Varroa mites and honey bee colonies in New Zealand and examines associations between particular mite and bee viruses.
| Michael W. Zabrodski et al. | Scientific Reports | 2022-05-25
Demonstrates how detecting Paenibacillus larvae spores in pooled extracted honey can be used to estimate apiary-level risk of American foulbrood.
Reviews the epidemiology of deformed wing virus and evidence that genotype B has expanded globally and replaced genotype A in many honey bee populations.
| Dominika Kadlečková et al. | mSystems | 2022-05-09
Uses metagenomic sequencing to document the diverse virome of apparently healthy honey bee colonies, including widespread known and previously undescribed viruses.
| Thomas A. O'Shea-Wheller et al. | Scientific Reports | 2022-04-07
Evaluates a selectively bred honey bee stock and finds improved resistance to Varroa destructor and reduced transmission of mite-associated viruses.
| Joachim R. de Miranda et al. | Virology Journal | 2022-01-15
Reconstructs the history of Egypt bee virus and explores its relationship to the deformed wing virus complex and historical honey bee mortality.
| Szymon Smoliński, Aleksandra Langowska, and Adam Glazaczow | Scientific Reports | 2021-11-15
Uses long-term data to show that warmer seasonal temperatures can contribute to larger autumn Varroa populations by extending conditions favorable to bee brood and mite reproduction.
| Lina Sprau, Martin Hasselmann, and Peter Rosenkranz | Apidologie | 2021-10-15
Tests assumptions about Varroa-sensitive hygiene and finds that mite reproduction itself does not consistently trigger hygienic removal or recapping by workers.
| Kelly Kulhanek, Andrew Garavito, and Dennis vanEngelsdorp | Scientific Reports | 2021-03-29
Shows that movement of non-natal bees between colonies is associated with accelerated growth of Varroa mite populations, highlighting the importance of drift and robbing.
| George Peter Hawkins and Stephen John Martin | Apidologie | 2021-03-15
Examines naturally Varroa-resistant honey bee populations in the United Kingdom and identifies elevated recapping behavior and reduced mite reproduction.
Provides a practical overview of Varroa, foulbrood diseases, Nosema, hive beetles, wax moths, predators, and other health problems encountered in colonies.
| Rassol Bahreini et al. | Scientific Reports | 2020-12-09
Compares the toxicity of potential Varroa-control compounds to both mites and honey bees, emphasizing the need for treatments with a wide margin of bee safety.
| Albert J. Robertson et al. | Scientific Reports | 2020-02-07
Uses kinome analysis to identify biological pathways and potential biomarkers associated with honey bee tolerance to Varroa mite infestation.
Reviews interactions between queen reproductive quality, parasites, pathogens, and colony health.
Honey Bee — Microbiome, Immunity, and Probiotic Research
Identifies characteristic changes in honey bee intestinal microbial communities following exposure to clothianidin and thiamethoxam.
Characterizes bacterial communities associated with Korean honey bees and contributes regional information to understanding the core bee microbiome.
Compares microbiomes across honey bee species and identifies evolutionary differences in microbial composition and pollen-processing functions.
Finds that spirulina and Chlorella supplements can improve worker longevity and stimulate components of honey bee immune defense.
Reviews how pollen diversity, nutrition, and environmental conditions shape the specialized microbial community living in the honey bee digestive tract.
Provides metagenomic datasets for studying how agricultural crop environments and associated exposures influence honey bee gut microbes.
Characterizes the distinctive microbiome and bacteriophages of honey bee queens using metagenomic sequencing.
Compares microbial diversity in hive workers and foragers and highlights functional differences associated with age and task.
Tests how parasite infection, probiotic supplementation, and neonicotinoid exposure interact to alter honey bee survival and gut microbial communities.
| Honey Bee Microbiome Researchers | Journal of Insect Science | 2023-12-06
Reviews probiotics and in-hive fermentation as potential sources of beneficial microbes for strengthening disease resistance and honey bee gut health.
| Erick V. S. Motta and Nancy A. Moran | Nature Reviews Microbiology | 2023-12-04
Reviews the specialized honey bee gut microbiota, how it is established, and its roles in digestion, immunity, metabolism, disease resistance, and host health.
Links relatively mild colony stress with measurable shifts in honey production activity and the microbiomes of resident bees.
| Brendan A. Daisley et al. | ISME Journal | 2023-06-14
Compares probiotic delivery systems and shows that application method can strongly influence the ability of beneficial bacteria to protect honey bees from pathogens.
| Honey Bee Probiotic Researchers | Saudi Journal of Biological Sciences | 2023-04
Isolates Lactobacillus casei A14.2 from honey bees and evaluates characteristics that could make the strain useful as an immunomodulating probiotic.
| Honey Bee Microbiome Researchers | Microorganisms | 2023-02-28
Examines how probiotic feeding affects Nosema infection and the gut microbiota of adult honey bees.
Reports improved brood, food storage, and colony activity after feeding colonies a mixture of honey bee-associated lactic acid bacteria.
| Márton Papp et al. | PLOS One | 2022-09-09
Surveys honey bee gut bacterial communities across climatic and seasonal conditions and documents natural geographic and temporal microbiome variation.
| Casey L. Gregory et al. | Journal of Insect Science | 2022-03-01
Demonstrates that laboratory hoarding cages themselves can alter honey bee gut bacterial abundance and reduce aspects of worker immune function.
| Shuo Jia et al. | Frontiers in Microbiology | 2022-01-18
Shows that tetracycline-induced disruption of the honey bee gut microbiota can persist and be transmitted to nestmates through social interactions.
| Honey Bee Microbiome Researchers | Scientific Reports | 2022
Examines geographic and seasonal changes in honey bee microbial communities and identifies bacterial patterns associated with measures of colony health.
Honey Bee — Nutrition, Pollen, Foraging, Feeding, and Overwintering
Reports research suggesting honey bee foraging distances and pesticide residues may allow workable organic-honey standards with smaller buffers than currently required.
Shows that different pollen and carbohydrate diets can alter worker survival, physiology, and gut microbial composition.
Uses thousands of bee-collected samples across Europe to show how warming and drying could reduce the diversity of plants available as honey bee forage.
Explores how honey bee gene expression responds to nutrients and how this knowledge might support more precisely formulated supplemental diets.
Reviews genetic and physiological mechanisms through which heat, drought, altered seasons, and other climate-related pressures can affect honey bees.
Finds that resource abundance and environmental signals can outweigh supplemental pollen quality when colonies allocate foragers during avocado bloom.
Finds that almond pollination can strengthen colonies and that flowering cover crops provide additional benefits extending beyond the pollination season.
Reviews environmental adaptations of Apis mellifera intermissa and Apis mellifera sahariensis in North African climates.
Investigates connections among pollen quality, gut microbes, immunity, and nutritional stress in honey bees.
Research | E. L. Niño Bee Lab | University of California, Davis | 2025-04-08
Summarizes research on almond pollination, queen reproductive biology, Varroa management, nutrition, and applied honey bee health.
Reviews honey bee requirements for proteins, amino acids, carbohydrates, lipids, sterols, vitamins, minerals, and other nutrients.
Develops a nutritionally enhanced yeast capable of supplying sterols honey bees normally obtain from pollen, potentially improving artificial bee diets.
Uses DNA metabarcoding to identify hundreds of forage plants and shows how season and land use influence African honey bee nutrition in Taita Taveta County.
Uses pollen analysis to evaluate the floral resources and nutritional context of managed colonies placed among native plants.
Examines which pollens honey bees select and how differences in nutrient chemistry may influence colony foraging choices.
Models how warmer cold seasons can increase colony energy consumption and undermine overwintering survival.
Discusses evidence that free-living western honey bee colonies constitute a substantial and often overlooked part of the global honey bee population.
Demonstrates that nutritional quality strongly influences how honey bees withstand combinations of viral infection and pesticide exposure.
| Alexander McMenamin et al. | ACS Agricultural Science & Technology / USDA ARS | 2023-08-15
Tests a microalgal feed additive in commercial colonies used for crop pollination and evaluates its potential as an alternative supplemental protein source.
Reports research showing that refrigerated storage of mated queens may improve queen survival and give beekeepers greater flexibility in replacing failing queens.
Provides a seasonal framework for understanding brood production, swarming, forage availability, winter-bee development, food stores, and Varroa management.
| Honey Bee Nutrition Researchers | Journal of Economic Entomology | 2023
Measures seasonal availability of beneficial phytochemicals in honey and stored pollen and discusses whether targeted supplementation might improve colony nutrition.
| Gerald Rutschmann et al. | Journal of Applied Ecology | 2023
Decodes thousands of waggle dances to examine honey bee foraging distance, habitat preference, and colony performance in Central European forest landscapes.
| Honey Bee Pollination Researchers | Basic and Applied Ecology | 2022
Finds that colonies placed in almond orchards gather substantial amounts of non-almond pollen, demonstrating the importance of surrounding floral diversity during crop pollination.
| Laura Milla et al. | Ecological Solutions and Evidence | 2022
Evaluates pollen DNA metabarcoding from honey bees as a complementary method for monitoring flowering-plant communities and identifying important forage resources.
| Oregon State University | OSU Extension Service | 2021
Describes research designed to compare the nutritional value of more than 100 crops, native plants, and ornamentals used as forage by honey bees and other pollinators.
| Chris Branam and Ramesh Sagili | Oregon State University Extension | 2019-08-28
Reports research identifying nutritional shortcomings for colonies deployed in crops such as highbush blueberry and hybrid carrot seed and stresses the value of diverse pollen.
| Vincent A. Ricigliano et al. | Scientific Reports | 2018-07-11
Follows colonies through overwintering in a warm climate and examines how nutrition and queen age influence colony physiology and performance.
| Jason A. Rothman et al. | Microbial Ecology | 2018-02-03
Investigates longitudinal effects of supplemental forage on honey bee microbiota and documents substantial variation among individual bees and colonies.
| USDA National Agricultural Library | USDA | n.d.
Summarizes research investigating how pollen nutrition, bee bread, pesticide exposure, crop pollination, and Varroa interact to influence honey bee colony growth and survival.
Honey Bee — Pesticides, Chemical Stress, and Environmental Contaminants
Uses radiotracers to show how workers initially filter pesticide contamination and how chronically exposed queens can transfer accumulated chemicals into eggs.
Reviews the effects of neonicotinoids on honey bee survival, behavior, nervous-system function, immunity, oxidative stress, and gene expression.
Uses computational toxicology to assess potential honey bee risks posed by pesticides commonly associated with orchard production.
Tests lethal and sublethal pesticide exposures and documents effects on locomotion and proboscis-extension behavior in Africanized honey bees.
Examines interactions between nutrition and low-level clothianidin exposure, emphasizing that pollen provides protective components beyond basic protein and carbohydrate content.
Finds synergistic toxicity from an insecticide-fungicide combination and examines oxidative stress, intestinal damage, and cellular responses.
Screens bee products for hundreds of pesticides and demonstrates how hive materials can provide information about environmental chemical exposure.
| Honey Bee Environmental Toxicology Researchers | Science of the Total Environment | 2024-10-15
Documents spatial and seasonal variation in pesticide residues found in honey bees and honey collected in western Mexico.
| Anna Keodara et al. | Scientific Reports | 2024-10-01
Demonstrates that a fungicide and neonicotinoid insecticide can impair flight behavior in pollen-foraging honey bees.
| Honey Bee Toxicology Researchers | Pesticide Biochemistry and Physiology | 2024-09
Finds synergistic effects of chlorothalonil exposure and Varroa parasitism on worker survival, fat-body health, and gene expression.
| Honey Bee Microbiome Researchers | Pesticide Biochemistry and Physiology | 2024-05
Shows that fluvalinate exposure alters honey bee gene expression and gut microbial communities, illustrating interactions between detoxification and the microbiome.
Uses a network approach to show that real colonies encounter complex combinations of pesticides, viruses, mites, and other stressors rather than isolated threats.
| Honey Bee Ecotoxicology Researchers | Ecotoxicology and Environmental Safety | 2024-01-01
Shows that workers of different ages respond differently to pyraclostrobin exposure, with effects on metabolism, immunity, and physiological stress responses.
Describes evidence that pesticide mixtures and spray adjuvants can interfere with honey bee responses to important social odors and pheromones.
Reports extensive pesticide-residue testing of beeswax and explains how chemicals can accumulate in comb reused for many years.
| Honey Bee Cognition Researchers | Apidologie | 2023-09-21
Finds that exposure to the Varroa-control chemical fluvalinate can impair associative learning and memory in adult honey bee foragers.
| K. P. Hester et al. | Environmental Pollution | 2023-06-20
Measures pesticide residues in pollen collected by honey bee colonies at ornamental plant nurseries and assesses potential risks from mixtures encountered while foraging.
| Mohamed Alburaki, Shayne Madella, and Steven C. Cook | Scientific Reports | 2023-03-09
Shows that unusually low or high ambient temperatures can amplify insecticide toxicity and alter stress-related gene expression in honey bees.
| Raissa Santana Serra et al. | Ecotoxicology | 2023-02-06
Finds that the fungicide azoxystrobin can cause histopathological and cellular damage in the honey bee midgut.
| Tao Cang et al. | Environment International | 2023-01-18
Demonstrates mixture toxicity between the insecticide tetrachlorantraniliprole and fungicide tebuconazole and investigates physiological mechanisms behind combined effects.
Honey Bee — Queens, Genetics, Breeding, and Population Diversity
Beekeeping: Cell Builder Basics | Penn State Extension | Pennsylvania State University | 2026
Explains the biological principles and colony-management techniques used to induce workers to rear large numbers of queen cells.
Provides procedures for safely introducing instrumentally inseminated laying queens into small colonies.
Examines genomic mixing between African- and European-derived honey bee lineages and the geographic structure of Argentine populations.
Explains queen development, larval feeding, reproductive biology, mating, egg production, and the central role of queen quality in colony performance.
Evaluates indoor overwintering of mated queens and measures queen survival and subsequent colony performance.
Compares Italian and Russian honey bee queens under pollen deprivation and identifies stock-dependent differences in body mass, egg production, and reproductive investment.
Investigates how colony social environment and nutrition influence larval development and the production of high-quality queens.
Tests whether commercially selected Italian honey bee strains can be reliably distinguished using mitochondrial genome markers.
Describes management practices designed to improve acceptance of instrumentally inseminated queens before they begin laying.
| L. A. Holmes et al. | Scientific Reports | 2023-10-12
Compares imported and Canadian-produced queens and evaluates morphology, sperm storage, colony performance, disease symptoms, productivity, and winter survival.
| Steven M. Carr | Scientific Reports | 2023-06-09
Uses complete mitochondrial genomes from multiple honey bee subspecies to revisit competing hypotheses about the phylogeographic history of Apis mellifera.
| Honey Bee Queen Biology Researchers | PLOS One | 2023-04-27
Finds lasting differences in queen-brain gene expression after pesticide exposure during development.
| Autumn Canaday | USDA Agricultural Research Service | 2023-02-15
Reports nationwide mitochondrial DNA research indicating relatively low genetic diversity among U.S. honey bee populations and discusses implications for resilience.
| Samuele Bovo et al. | Scientific Reports | 2022-11-15
Demonstrates that environmental DNA contained in honey can provide information about the population genomics of the bees that produced it.
Reviews practical ways genomics can be used to improve breeding, disease resistance, diagnostics, and overall management of honey bee health.
Examines morphometric and microsatellite variation among honey bee populations from rainforest and savanna regions of Nigeria.
| Joseph P. Milone and David R. Tarpy | Scientific Reports | 2021-01-13
Examines how developmental exposure to pesticide-contaminated wax and pollen influences queen reproductive traits and subsequent colony growth.
| European Honey Bee Genetics Researchers | Scientific Reports | 2020
Compares historical museum specimens with modern honey bees and finds evidence of declining genetic diversity and changing admixture patterns across Europe.
| Ramesh R. Sagili et al. | Scientific Reports | 2018-05-16
Finds that workers selecting larvae for emergency queen rearing respond more strongly to larval nutritional condition than to genetic relatedness.
About Krispn Given | Purdue Bee Lab | Purdue University | n.d.
Profiles Purdue's honey bee breeding work, including selection for mite-biting and other behavioral traits intended to improve Varroa resistance.
Honey Bee — Behavior, Communication, Technology, and Social Immunity
| Olav Rueppell et al. | PLOS One | 2025-06-09
Tests whether prior learning rather than an innate blank-slate condition helps explain behavioral performance in honey bees.
Finds stable individual differences in defensive behavior while showing that alarm pheromone and social context can shift a bee's likelihood of stinging.
Examines how workers performing hygienic tasks are positioned within colony social networks and how disease-defense behavior intersects with social organization.
Links genetic variation and brain gene expression with differences in trophallaxis, the food-sharing behavior that helps structure honey bee social networks.
Demonstrates that artificial light at night can disturb honey bee circadian rhythms and sleep, with potential consequences for communication and foraging.
Describes an autonomous robotic and computer-vision system capable of continuously tracking queen behavior and hive activity over long periods.
Shows how landscape structure influences foraging distance and the extent to which colonies rely on waggle-dance information to recruit workers.
Develops a framework for understanding how thousands of workers collectively determine when a colony should replace its queen.
| Honey Bee Behavioral Ecology Researchers | Animal Behaviour | 2023-04
Shows that waggle-dance communication can shorten colony foraging distances and concentrate foragers within rewarding areas.
| Shihao Dong, Tao Lin, James C. Nieh, and Ken Tan | Science | 2023-03-10
Demonstrates that inexperienced bees perform less accurate waggle dances when deprived of opportunities to observe experienced dancers, providing evidence of social learning.
Summarizes research showing that young honey bees improve the accuracy of their waggle dances by observing experienced nestmates.
| Honey Bee Cognition Researchers | Animal Cognition | 2023-01-06
Tests whether individual honey bees show consistent cognitive performance across different learning tasks and sensory modalities.
Demonstrates machine-learning methods for identifying, segmenting, and tracking individual honey bees inside observation colonies.
| D. Zarate et al. | Scientific Reports / UC San Diego Nieh Lab | 2023
Reports seasonal differences in defensive behavior between European and scutellata-hybrid honey bees in Southern California.
| Honey Bee Behavioral Ecology Researchers | Behavioral Ecology and Sociobiology | 2022-02-11
Shows that immune-challenged workers may leave colonies voluntarily or be expelled by nestmates, potentially reducing disease transmission through social immunity.
| Marla Spivak and Robert G. Danka | Apidologie | 2020-11-19
Reviews decades of research on hygienic behavior, Varroa-sensitive hygiene, disease resistance, chemical cues, and selective breeding.
| Honey Bee Behavior Researchers | Journal of Asia-Pacific Entomology | 2020-06
Finds that imidacloprid exposure alters waggle-dance communication and affects expression of genes linked with learning and memory.
Identifies brood-associated cuticular compounds capable of triggering hygienic removal behavior in honey bee workers.
| Alison McAfee et al. | Scientific Reports | 2018-04-09
Demonstrates that oleic acid, a chemical associated with dead organisms, can trigger hygienic removal of brood by honey bee workers.
The Flight Paths of Honeybees Recruited by the Waggle Dance | James R. Riley et al. | Nature | 2005
Uses harmonic radar to directly track recruited foragers and test how accurately honey bees translate waggle-dance information into flight paths.
Honey Bee — Pollination, Ecology, Policy, Management, and Network Effects
EPA Actions to Protect Pollinators | U.S. Environmental Protection Agency | EPA | 2026
Summarizes federal pesticide-risk measures intended to reduce honey bee and other pollinator exposure, including restrictions and revised risk-assessment procedures.
Insect Pollinator Health | European Food Safety Authority | EFSA | 2026
Reviews European work on honey bee pesticide-risk assessment, colony modeling, data sharing, and broader pollinator-health science.
New Labeling for Neonicotinoid Pesticides | U.S. Environmental Protection Agency | EPA | 2025-11-12
Describes bee-protection language added to neonicotinoid pesticide labels, including restrictions on applications while bees are actively foraging.
Explains why increasing managed honey bee hive density is not equivalent to conserving wild bees and argues for habitat restoration and pesticide reduction.
Examines how pesticide protections, flowering cover crops, and payment arrangements could be incorporated into pollination contracts to reduce beekeeper risk.
Finds that introduced managed honey bees can restructure plant-pollinator networks and produce positive, negative, or neutral reproductive effects depending on plant species.
| Daniela Scaccabarozzi et al. | Scientific Reports | 2024-06-18
Finds that introduced honey bees can remove orchid pollen without effectively depositing it, potentially reducing pollination efficiency for some native orchids.
Documents aggressive displacement of other flower-visiting insects by wild East African lowland honey bees foraging on acacia resources in Kenya.
Synthesizes global evidence that inadequate animal pollination can reduce not only crop yield but also characteristics affecting food quality.
| Sydney H. Worthy et al. | PLOS One | 2023-07-13
Finds that honey bees can substantially alter the overall structure of plant-pollinator networks without necessarily changing individual interactions among wild species.
| Issaka Wendpanga Kanazoe et al. | African Journal of Ecology | 2023-05-19
Studies how climate and floral diversity influence the foraging activity of Apis mellifera adansonii in a West African savanna.
| James Wolfin et al. | Urban Ecosystems | 2023-03-21
Shows that adding low-growing flowering plants to turfgrass lawns can provide forage for both managed honey bees and diverse wild bee communities.
| Dillon Travis and Joshua Kohn | Journal of Pollination Ecology | 2023
Compares within-plant flower visitation by honey bees and other pollinators and considers consequences for self-pollination and plant reproductive fitness.
| Pollinator Ecology Researchers | Oecologia | 2022-04-05
Shows that plant and pollinator functional traits help determine the degree of floral-resource overlap between managed honey bees and wild pollinators.
| Pollination Network Researchers | Basic and Applied Ecology | 2022
Examines how climate and human influence affect the central role of introduced honey bees in plant-pollinator networks outside their native range.
| Urban Pollinator Researchers | Biological Journal of the Linnean Society | 2021-04-05
Finds that relationships between introduced honey bees and native bees in Australian urban areas vary substantially by habitat, year, body size, and resource overlap.
| Imre Demeter, Adalbert Balog, and Miklós Sárospataki | Frontiers in Ecology and Evolution | 2021
Examines wild bee diversity at different distances from honey bee apiaries and evaluates whether competition differs between small- and large-bodied wild bees.
Explains how growers and beekeepers can assess colony strength and determine whether colonies are capable of providing effective crop-pollination services.
Update on Neonicotinoid Pesticides and Bee Health | Health Canada | Government of Canada | 2014
Summarizes Canadian assessments of neonicotinoid exposure alongside other honey bee stressors including parasites, nutrition, weather, queen quality, and management.
Provides a broad introduction to colony organization, queens, workers, drones, development, swarming, hive management, honey production, and the fundamentals of beekeeping.
Honey Bee — Climate, Feral Colonies, Pollution, and Historical Research
| Honey Bee Ecotoxicology Researchers | Science of the Total Environment | 2024-12-20
Compares the sensitivity of Apis mellifera and Apis cerana to chlorantraniliprole and identifies differences in survival, sucrose responsiveness, detoxification, and immunity.
| Amandeep Singh et al. | Environmental Science and Pollution Research | 2023-06-21
Evaluates honey bees and honey as biological indicators of agricultural pesticide contamination across heavily farmed areas of Punjab.
| Oliver Visick and Francis Ratnieks | Ecology and Evolution | 2023
Reviews studies measuring wild honey bee colony density around the world and evaluates ecological and geographic factors associated with free-living populations.
| Martina Calovi et al. | Scientific Reports | 2021-01-15
Links summer weather conditions with subsequent winter survival of honey bee colonies in the northeastern United States.
| May R. Berenbaum and Reed M. Johnson | Journal of Agricultural and Food Chemistry | 2016
Discusses aggregate pesticide exposure in agroecosystems and argues that honey bee risk assessments need to consider multiple exposure pathways and life stages.
| Yahya Al Naggar et al. | Journal of Insect Physiology | 2015-09-21
Tests environmentally relevant mixtures of organophosphorus insecticides and demonstrates that chemical combinations can produce effects different from individual compounds.
| Idalécio Pacífico da Silva et al. | Apidologie | 2015-04-14
Measures pesticide exposure in honey bees used for melon pollination and compares residues with bees foraging outside intensive crop environments.
| Yahya Al Naggar et al. | Ecotoxicology and Environmental Safety | 2015-04
Measures organophosphorus insecticides in honey, pollen, and bees from Egypt and evaluates potential hazards to honey bee colonies.
Compares gene-expression profiles of bees from Colony Collapse Disorder and healthy colonies and identifies molecular patterns potentially associated with the syndrome.
| Dennis vanEngelsdorp et al. | PLOS One | 2009-08-03
Provides one of the foundational scientific descriptions of Colony Collapse Disorder and finds evidence that affected colonies experienced multiple interacting stressors rather than one obvious cause.
