:confused: My brother and sister-in-law live in Missouri and have been invaded by green and black striped worms, about and inch or so long (no hair). They have attacked a large pine, so we think they're pine webworms. However they've eaten other plants, and are all over their back porch and deck. We don't see the typical whitish webs, though, only smallish webs at the ends of some branches. And—this is weird—when I parked my car under the tree, thousands of them congregated around my tires!
Any suggestions of how to get rid of these worms? The tree is extremely tall, so I don't think they can spray.

Try applying thuricide
It's a natural bacteria that only kills moth and butterfly larvae
Need to by applied every spring when nests are present.
Thuricide - Bt - Bacillus Thuringensis Concentrate 8 oz