How do I treat a bag worm infestation on my evergreen shrubs?

Question

I have an arborvitiae and two well established cedar shrubs that are covered with bag worms and the foliage is starting to turn brown. I live in Iowa. What's the best treatment? Will my shrubs die?

Answer 1

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.

Answer 2

do no longer supply her something like Ivermectin. it may kill off all of the worms at as quickly as and allow them to aim to pass for the time of the pony's device in a great blob of worms, inflicting a blockage interior the intestines which of course might bring about colic. it is oftentimes deadly! there's a undeniable sort of de-wormer (which i can't undergo in innovations the call of precise now yet will edit whilst i come across it), which will kill off the worms over a era of a few week. Or, you are going to be able to desire to purchase a on a daily basis de-wormer, which you will feed interior the pony's grain as quickly as an afternoon. it is yet an alternate decision which will enable the worms to die off slowly and not reason a blockage. i might call the vet and ask them concerning the proper wormer for the pony, somewhat when you consider that she's have been given diarrhea. each from time to time wormers might reason much extra diarrhea so which you want to be careful. Calling and asking your vet may be your maximum secure wager.

Answer 3

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.

Answer 4

while in the bag, the only thing you can do is hand pick them and destroy them while still in the bag