well i'm not sure if web worms are tent and or army worms or some other type of worm, but here they came in june and july and were a massive outbreak..and worried me too about next year..
i destroyed any i found on my property as some areas were completely defoliated in surrounding neighborhoods and i didn't want that here..
unfortunately the adults fly..and can desposit their egg cases wherever they choose..
the kind we have attack first the fruits such as cherries and apples..but also oaks and maples and others such as the small shrubby
trees and bushes