The basic finding is that compared to pesticide use in the absence of GE crops, farmers applied 318 million more pounds of pesticides over the last 13 years as a result of planting GE seeds. This difference represents an average increase of about 0.25 pound for each acre planted to a GE trait.

GE crops are pushing pesticide use upward at a rapidly accelerating pace. In 2008, GE crop acres required over 26% more pounds of pesticides per acre than acres planted to conventional varieties. The report (.pdf) projects that this trend will continue as a result of the rapid spread of glyphosate-resistant weeds.

via The Organic Center :: State of Science :: Pesticides.