“In those exposed to gamma-cyhalothrin, there was a higher death rate among worker bees. And colonies that were exposed to both kinds of pesticides were likelier to fail. The experiment was exceptionally long and detailed, the scientists say. It lasted four weeks, whereas current guidelines test pesticides on bees for only up to 96 hours. In addition, it looked at what happened when bees were exposed to two chemicals at the same time and at the changes in a colony’s social structure.”
