What kills those big nests of army worms?

I've had big nests of Army worms move into some of my apple trees ,can't really use a spray because if they fall out the chickens might try to eat them .Doesn't seem like anything eat those nasty worms ,they will strip down a whole tree of all their leaves ,then they move on to another and do the same . any advice would be great ,thanks Dee Anna.
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