Study: Up to 50 Percent of French Pollen Loads Contaminated by Pesticides

A Survey of Pesticide Residues in Pollen Loads Collected by Honey Bees in France
Journal of Economic Entomology, 2006 Apr;99(2):253-62

Residues of 19 searched compounds were found in samples. Contamination by pesticides ranged from 50 to 0%. Coumaphos and tau-fluvalinate residues were the most concentrated of all residues…

Possible origins of these contaminations, concentration and toxicity of pesticides, and the possible consequences for bees are discussed.