[forgotoldacc]

Fly over America and you'll see that it's basically all farmland , paved over, or desert. Lots of roads have trees lining them because the space between them is hard to use. Go up in an airplane above those roads and you'll see there isn't too many truly thick forest, outside of mountains where it's hard to build things. Alternatively, pan around the world with google maps. America is only about 33% forest.

And even then, insects don't only live in forests. They live in fields, marshes, all sorts of terrain. And it's overwhelmingly tamed and sterilized.