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Use Bt. One brand name is Thurmicide. It is bacteria that causes their gut to rupture. Perfectly safe for humans. I had a massive infestation of cabbage moths and it wiped them out in a day or so.
 
Just mix a bit of Sunlight dish soap in water and spray the caterpillars. It'll kill them all and a little bit of soap won't hurt the plants. When we got the caterpillar invasion, I was washing them off the side of the house by the millions and carting the dead bodies away by the wheelbarrow load.

The next year I got smart and made a two foot high fence out of 6 mil poly and smeared axle grease along the top of it.
 
=LLigetfa;697038]Just mix a bit of Sunlight dish soap in water and spray the caterpillars. It'll kill them all and a little bit of soap won't hurt the plants.
I'll second this one. I went to the town Board of Health and they said the same thing. It works good too. Take care..:trink40:
 
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