>>38 This is a really good idea since I don't believe insects necessarily count as biological weapons (unless they were spreading disease; if they're just eating, they're just being themselves). Also, why not just blame the sudden change in behavior on global warming or cell phone towers or something?

The main problem is that they'd only be good for attacking areas already prone to them and that's basically Africa at this point. I can't think of a good reason to invade it, but maybe someone can...

Technological problems include keeping some sort of horrible insect factory secret and also developing a means of planting lots of eggs just under the soil without being detected.