A devastating wave of honeybee colony losses has swept across the United States, prompting an urgent investigation led by experts at Cornell University. The die-offs—reportedly affecting over 60% of managed colonies—have jeopardized critical pollination efforts and triggered estimated losses of $139 million for commercial beekeepers nationwide.

Cornell’s Dyce Lab for Honey Bee Studies, led by entomology professor Scott McArt, is now at the center of a national push to determine what’s killing America’s bees at such an alarming scale.

How Severe Are the Honeybee Losses?

According to early data from a national survey involving 234 commercial beekeepers, this winter may mark the largest managed bee colony loss in U.S. history.

Key stats:

• 60%+ of colonies lost on average
• Some beekeepers report 70–100% loss rates
• Financial losses exceed $139 million
• Over 70% of managed bees are used for California almond pollination

This collapse comes at a critical time, just as commercial beekeepers prepare for the annual almond pollination season, which relies heavily on transported honeybee colonies from across the country.

What Is Cornell Doing to Identify the Cause?

In response to mounting concerns and a shortfall in federal testing capacity, the Cornell Chemical Ecology Core Facility—also directed by McArt—is stepping in to analyze 500 bee-related samples for pesticide contamination.

The lab is:

• Using advanced mass spectrometry to detect chemical residues
• Processing up to 50 samples per week
• Operating with funding from a private anonymous donor
• Pausing non-urgent commercial testing to prioritize this national emergency

McArt noted that USDA labs have faced staffing and funding cuts, limiting their ability to rapidly process pesticide-related tests. As a result, Cornell’s lab was called upon to assist in the investigation.

What Could Be Causing the Die-Offs?

While full lab results won’t be available for at least another month, several potential culprits are under investigation:

Under review:

• Varroa mites (parasites known to weaken bees)
• Viruses transmitted through mites
• Pesticides, especially neonicotinoids

The USDA’s Bee Research Laboratory in Maryland is handling parasite and virus testing, while Cornell focuses on pesticide analysis.

Similar incidents in Florida in 2023—where large-scale die-offs affected up to 90% of colonies—were ultimately linked to neonicotinoid pesticide exposure, possibly tied to treatments used in citrus groves.

Why It Matters: Pollination, Agriculture & Food Supply

Honeybees are responsible for pollinating over $15 billion worth of crops annually in the U.S., including almonds, berries, melons, and vegetables. A collapse in bee populations has far-reaching consequences not only for agriculture and food supply chains but also for ecosystem stability.

The almond industry alone depends on 2 million+ bee colonies transported to California every season.

What’s Next?

The Cornell team expects initial pesticide test results in the coming weeks, which could provide critical clues to the cause of the die-offs. In the meantime, both federal and academic labs are ramping up efforts to track patterns, isolate variables, and recommend mitigations.

Stay Updated on the Honeybee Crisis

• Follow Cornell CALS and Dyce Lab updates
• Monitor USDA Bee Lab reports
• Read upcoming publications on pesticide impacts in Florida

📌 Tip: Beekeepers, growers, and policymakers should prepare for emergency pollination strategies and explore bee-friendly pesticide alternatives as findings emerge.