Yes, and that was brought up, a previous modification is facing resistance: "Corn growers need a new tool. For a decade they have been combating the rootworm b

Yes, and that was brought up, a previous modification is facing resistance: "Corn growers need a new tool. For a decade they have been combating the rootworm by planting so-called BT crops, which are genetically engineered to produce a toxin that kills the insects when they eat the crop. Or at least the toxin is supposed to kill them. But rootworms are now evolving resistance to at least one BT toxin."