I have a problem with my squash, cucumber and melon plants. I believe it may be caused by stinkbugs. The plant's leaves start to droop and wilt, the stem starts to rot not too far from where it comes out of the ground, and leaves also start to rot where the stem attaches to the plant stalk--leading to dead plants. I have seen stinkbugs, both mature and the white little ones on the stems and on the undersides of leaves. There are also little copper colored dots on the undersides, which I think are eggs laid by the stinkbug. I have tried killing them, but there's more of them than me and it seems to be a losing battle. What can I do to prevent this next year? It seems to happen every year, no matter how weed-free I keep the garden.