Apples made the top of the list for produce containing pesticide residue, but how much is unsafe? iStockphoto.com hide caption
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One class of insecticides makes an entire corn plant poisonous to many insects that feed on it, including bees. iStockphoto.com hide caption
Bedbug insecticide products are displayed at a bedbug summit in Illinois. Brian Kersey/Getty Images hide caption
Kevin Gomes shops for produce at Pacifica Farmers Market in Pacifica, Calif., in March. AP hide caption
Sugarsnap peas are ready for harvest at the Many Hands Organic Farm in Barre, Mass., in the summer of 2009. Charles Krupa/AP hide caption
A pesticide sprayer rolls through an apple orchard. iStockphoto.com hide caption