I think you might be confusing herbicides and pesticides.
Some GMO crops can lead to less pesticide usage as the plants can sometimes be engineered to be resistant to the pests targeted.
Weed plants don't generally attack the crop plant directly, instead they merely grow nearby and compete for various resources that the crops would otherwise be able to use.
GMO crops can be engineered to be resistant to specific herbicides. This leads to more of that herbicide (generally glyphosate) being used, since more herbicide = fewer weeds, and amounts of glyphosate that would kill non-GMO crops are tolerated by GMO crops.
I look at research. And in this case, it contradicts your claim.
"A steady, linear trend for increasing number of herbicide area-treatments over the last 25 years was observed for all crops except soybean. The linear trend was not statistically significant for soybean [...]"
Care to elaborate? Roundup ready crops have glyphosate resistance which allows for broad application of the herbicide on a field to kill off unwanted other crops, weeds, while not harming the crops with genetically engineered resistance. Otherwise, the application of herbicide would need to be targeted to only the unwanted plants, which is a more labor intensive process. Unless I’m misunderstanding something?
Some GMO crops can lead to less pesticide usage as the plants can sometimes be engineered to be resistant to the pests targeted.
Weed plants don't generally attack the crop plant directly, instead they merely grow nearby and compete for various resources that the crops would otherwise be able to use.
GMO crops can be engineered to be resistant to specific herbicides. This leads to more of that herbicide (generally glyphosate) being used, since more herbicide = fewer weeds, and amounts of glyphosate that would kill non-GMO crops are tolerated by GMO crops.