Why were crops such as Wheat and corn susceptible to insect pests?

Answer 1

Is it because they're resistant to insecticides?

Answer 2

Those crops tend to be produced as mono cultures, mile after mile of fields of the same crop. That makes it easy for the insects to adapt to the crop culture and multiply fast without having to look around for the stuff they like. It is sort of like you are growing hordes of the insects on purpose :)

Answer 3

Where? When?

Answer 4

Making it worse is that often the same crop is grown in the same field season after season, making it super easy for the bugs.

Answer 5

ok Thank you.