Times of India (Oct. 3, 2012) | Planting genetically modified (GM) crops should reduce the use of chemical pesticides, right? A study of 16 years of growing GM cotton, soyabean and corn in the US contradicts this. It shows that herbicide use on such crops has grown by 239 million kilograms between 1996 (when GM crops were first introduced in US by Monsanto) and 2011. Insecticide usage has declined on Bt crops by 56 million kilograms in the same period.