 Spray, hand spray probably isn't going to do it. You'll need a hose end or something. But bagworms are just a different type of caterpillar. So there's a lot of products we can use for it. The eight spray works really well. BioAdvance makes a vegetable and garden that works well. And if you've got a ways to go or you've got a lot of them, the old malathion is highly effective on them.