Bag worms eating my plants, help!

Asked August 1, 2016, 3:08 PM EDT

I just noticed that I have bag worms eating one of my arborvitae out front, and have noticed that they're trying to spread to neighboring plants. No idea how long they've been there. I've read the sprays are effective earlier in their lives, but what can I do now to stop the destruction? And any idea if the plants will recover or is the damaged part irreparable? Any help is greatly appreciated.

Wicomico County Maryland

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