Honey bees are not technically going extinct, but they are dying at unprecedented rates. The 2024-2025 U.S. Beekeeping Survey recorded 55.6% colony losses, the highest since tracking began in 2010, marking record-high losses for the second year in a row. The crisis is driven not by a single cause but by several overlapping threats: parasites, pesticides, habitat loss, climate shifts, and the way these stressors compound each other.
Honey bees pollinate $15 billion worth of crops in the United States alone, covering more than 130 types of fruits, nuts, and vegetables. Their decline has real consequences for food systems, which is why the scale of recent losses has alarmed researchers and beekeepers alike.
Varroa Mites and the Viruses They Carry
The single most destructive threat to honey bee colonies worldwide is a tiny parasitic mite called Varroa destructor. These mites attach to bees and feed on their body fat, but the real damage comes from what they inject. Varroa mites act as biological vectors, directly delivering viral particles into a bee’s body and bypassing the natural defenses of the gut and outer shell that would normally block infection. This turns manageable, low-level viruses into full-blown systemic infections.
Research published in the Journal of Virology confirmed that at least nine different viruses actively replicate inside the mites themselves, meaning the mites aren’t just carrying viruses passively but are amplifying them. Among the most damaging is deformed wing virus, which causes shriveled, useless wings in developing bees and can collapse a colony within months. The mites spread it in both its A and B genotypes, and because they reproduce inside brood cells alongside developing bees, every new generation of bees in an infested hive faces exposure from birth.
What Pesticides Do to Bee Brains
A class of insecticides called neonicotinoids is widely used on crops and works by targeting the nervous system of insects. These chemicals bind to receptors in the central brain, and even at doses too low to kill bees outright, they interfere with memory, learning, social behavior, and navigation. For a foraging bee that needs to fly miles from the hive and find its way back, these impairments can be fatal.
Researchers tested three common neonicotinoids at non-lethal doses and found that treated bees had significantly lower rates of successful return to the hive. The bees could still handle the outbound portion of their flight, following recently learned routes, but they struggled with the return trip. Homing requires activating older spatial memories built during earlier exploratory flights, and the pesticides appeared to block retrieval of those memories or alter them entirely. Treated bees were less likely to make correct turns at recognizable landmarks and flew in less directed paths. A bee that can’t find its way home is a bee that’s lost to the colony.
Loss of Wildflower Habitat
Honey bees need a varied diet. Pollen from different plant species provides different nutrients, and colonies with access to diverse forage have stronger immune systems and better overall health. The problem is that modern agriculture has replaced enormous stretches of mixed habitat with single-crop fields. In the U.S. Midwest, where monoculture farming dominates, annual colony losses have exceeded 60% in some years.
Large monoculture fields may bloom heavily for a few weeks, giving bees a temporary surplus, but once that bloom ends, the landscape becomes a food desert. The loss of natural and semi-natural habitat surrounding farmland reduces both the variety and the year-round availability of flowers. Bees stuck in these nutritionally poor environments develop compromised immune systems, making them more vulnerable to pathogens and less resilient to other stressors. It’s the bee equivalent of surviving on a single food: technically enough calories, but missing essential nutrition.
Climate Change and Timing Mismatches
Bees and the plants they pollinate have evolved to operate on synchronized schedules. Flowers bloom when pollinators are active, and pollinators emerge when flowers are available. Climate change is disrupting that synchronization, and not evenly. Research published in the Proceedings of the National Academy of Sciences found that for every 4°C increase in long-term average temperature, flowering advanced by about 14 days. Generalist bees shifted their activity by about 17 days for a similar temperature increase, but specialist bees advanced by only 8 days. These differences create gaps where bees are active but flowers aren’t available, or flowers are blooming with no pollinators ready to visit them.
Even short-term temperature spikes matter. A warm anomaly of less than 1°C was enough to shift flowering by about 2 days. Over time, these small mismatches accumulate and reduce the reliable food supply bees depend on during critical periods of colony buildup in spring.
How These Threats Multiply Each Other
What makes the honey bee crisis so difficult to solve is that these threats don’t act in isolation. They interact, and the combination is often worse than the sum of its parts. One of the clearest examples involves pesticides and gut parasites. Researchers exposed honey bee colonies to sub-lethal levels of imidacloprid (the most widely used neonicotinoid at the time of the study) and then challenged bees with Nosema, a common gut pathogen. Bees from pesticide-exposed colonies developed significantly higher Nosema infections than bees from untreated colonies, even when the individual bees themselves had no detectable pesticide residue in their bodies.
This finding is important because it means the colony-level chemical environment weakens bees in ways that don’t show up as direct poisoning. A bee that seems fine by every toxicological measure can still be immunologically compromised, primed to succumb to infections it would normally fight off. Layer Varroa mites on top of that, injecting viruses into already-weakened bees foraging in a nutritionally poor landscape, and colony collapse becomes almost predictable.
Colony Collapse Disorder Explained
Colony Collapse Disorder, or CCD, became a headline term around 2006, but it describes a specific pattern that doesn’t account for all bee losses. According to the EPA, CCD occurs when the majority of worker bees in a colony vanish, leaving behind a queen, plenty of stored food, and a few nurse bees tending to young brood. The hallmark is the absence of dead bees near the hive. Workers simply leave and don’t return.
As many as 50% of affected colonies showed symptoms that didn’t match any previously known cause of bee death. The mystery of where the bees went is likely explained by the navigation impairment caused by pesticide exposure and the disorientation from viral infections: bees that can’t find their way home die scattered across the landscape rather than piling up at the hive entrance. CCD as a distinct phenomenon has become less commonly reported in recent years, but the underlying colony losses have continued and worsened. The threats that likely drove CCD haven’t gone away. They’ve become the background conditions of modern beekeeping.
Where Colony Numbers Stand Now
In the first quarter of 2024 alone, U.S. beekeepers with five or more colonies lost 396,820 colonies, about 15% of the total. The following quarter saw another 288,190 colonies lost, or 11%. These quarterly numbers add up to the record 55.6% annual loss rate reported for the 2024-2025 season. Losses were particularly severe among commercial beekeepers during winter, a period when healthy colonies should be clustered and conserving energy, not dying.
It’s worth noting that total honey bee numbers in the U.S. haven’t collapsed to zero because beekeepers actively replace lost colonies by splitting surviving hives and purchasing new queens. This artificial replenishment masks the severity of the problem. The species persists in managed settings not because it’s thriving but because an entire industry works year-round to keep pace with losses. Wild and feral honey bee populations, which don’t have beekeepers propping them up, have declined far more dramatically and are functionally gone from many regions where they were once common.