What method can use to control caterpillar?

Trapping caterpillars is very easy. In late summer all you have to do is sit under a willow or oak tree and look up. These little things will start to fall from the tree, to capture all of them find two adjasent trees and lay a large net, with tight knitting, between the two trees. Wait about twenty minutes after you see the first one fall and then collect the net. Otherwise you can just pick them up. If the are black and white, flip them onto their stomach and they will have a little penguin on their belly. It is really quite cool. Hope it helps.