How Glyphosate Affects Bees: A New Study
A study from Virginia Polytechnic Institute and State University reveals that glyphosate disrupts bee behavior, leading to a 13% reduction in their ability to work and altering brain chemistry. The findings were published in the Journal of Experimental Biology. Funding for the project came from the U.S. National Institute of Food and Agriculture. This research sheds light on how a widely used herbicide impacts essential pollinators, which are critical for global food production.
The investigation, led by Associate Professor of Entomology Margaret Couvillon and graduate student Laura McHenry, found that glyphosate—the active ingredient in most commercial agrochemicals—has a severe effect on honeybees. The scientists set up two artificial feeders: one containing pure sugar syrup and another with syrup laced with glyphosate. Results became apparent by the third day: bees that consumed the glyphosate-laced syrup flew out to collect nectar 13% less often.
Analyses showed that glyphosate caused changes in bee brain chemistry, disrupting the balance of amino acids and neurotransmitters.
“We wanted to test how glyphosate—the most popular pesticide on the planet—affects the brains and behavior of honeybees. They’re constantly picking it up as they fly over fields,” said Margaret Couvillon.She also emphasized that while a 13% drop in efficiency might seem minor for a single bee, it is a major blow to the entire hive.
“If the whole colony picks up the chemical, pollination work stops, honey production drops, and the hive simply won’t survive the winter,” she added.
Laura McHenry noted that understanding how herbicides affect beneficial insects is key to reducing environmental harm without hindering farmers. “If we understand exactly how weed killers impact beneficial insects, we can better choose when and where to treat fields,” she said.
Implications for Agriculture
The study’s results underscore the importance of examining pesticide impacts on ecosystems, particularly honeybees, which play a crucial role in pollinating agricultural crops. Given growing concerns about declining bee populations, this data could inform new regulations in the farming sector aimed at preserving biodiversity.
Countries that use glyphosate may need to reassess their policies to reduce negative effects on pollinating insects and ensure agricultural sustainability.