A new study authored by Charles M Benbrook of Washington State University, “Impacts of genetically engineered crops on pesticide use in the U.S. — the first sixteen years,” found troubling evidence that the use of genetically modified crops leads to greater pesticide use. This peer reviewed paper concludes,
Contrary to often-repeated claims that today’s genetically-engineered crops have, and are reducing pesticide use, the spread of glyphosate-resistant weeds in herbicide-resistant weed management systems has brought about substantial increases in the number and volume of herbicides applied. If new genetically engineered forms of corn and soybeans tolerant of 2,4- D are approved, the volume of 2,4-D sprayed could drive herbicide usage upward by another approximate 50%. The magnitude of increases in herbicide use on herbicide-resistant hectares has dwarfed the reduction in insecticide use on Bt crops over the past 16 years, and will continue to do so for the foreseeable future.
My two cents about genetically engineered ag: I’ve always thought the best arguement against GMOs relates to unintended consequences. The novelty of genetic modification, when compared to the slower pace of conventional plant breeding, is a perfect way to generate “black swans“. This is why I’ll be voting for Proposition 37 which will mandate the labeling of genetically engineered products in California.