In service to the US EPA Pesticide Program Dialog Committee (PPDC), the Pesticide Research Institute (PRI) conducted a survey to query beekeepers about acute bee kills related to pesticides.
The July/August 2012 U.C. Apiaries newsletter by Eric Mussen, Entomolgy Extension, University of California provides a detailed summary of results showing varying levels of colony deaths related to specific crops. Beekeepers pollinating cranberry or alfalfa hay reported the highest losses while some fruit crops (peaches, apples, pears and cherries) had much lower pesticide kills. Read the detailed summary at this link: July/August 2012 U.C. Apiaries newsletter. Or see the complete report at the Pesticide Research Institute website.