David Fischer, head of the ecotoxicology section at Bayer CropScience, insists that imidacloprid as a seed coating is not dangerous for honeybees. According to Bayer's and other studies, he says, the lowest level of imidacloprid that could cause an effect on honeybees is 20 ppb. When imidacloprid is used to coat seeds, the residues of the product in the pollen and nectar are never higher than 5 ppb, a level that "poses only a negligible risk to honeybees," he explains.
by Bette Hileman |
June 18, 2007