How do I treat a bag worm infestation on my evergreen shrubs?
I hаνе аn arborvitiae аnd two well established cedar shrubs thаt аrе covered wіth bag worms аnd thе foliage іѕ starting tο turn brown. I live іn Iowa. Whаt’s thе best treatment? Wіll mу shrubs die?
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while in the bag, the only thing you can do is hand pick them and destroy them while still in the bag
My son is a professional nurseryman and he says if they are smaller, perhaps an inch or less, spray with Bt, [Bacillus thurgiensis]. Your local nursery should know about this and have it. If they are larger and you don’t perceive a worm in the bag, hand pick them off.
They are in effect strangling the branches and you may eventually have to trim off some dead branches.
I have killed them by poking a hole in the bag and spraying with wasp and hornet spray, kills them deader than a door nail.