I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
The best way to control the caterpillars that eat cabbage is with a product containing B.t. There are several brands on the market including Thuricide, Dipel and Ortho's Bio Worm Killer. These products are natural and don't harm other types of insects, just caterpillars.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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