Apparently Bacillus Thuringiensis is used to genetically modify some kinds of plants/seeds like corn/potato/cotton etc, so the plants become naturally resistant

Apparently Bacillus Thuringiensis is used to genetically modify some kinds of plants/seeds like corn/potato/cotton etc, so the plants become naturally resistant to certain insects/worms. But these insects/worms are also now slowly getting resistant to the bacteria (evolution). It doesn't seem like there is genetically modified bacteria itself that is used as pesticide....