A quick dusting with Sevin or a spray with Sevin will get rid of the caterpillars very quickly. BT works well on most caterpillars. Last year I had some that multiple applications of BT did not deter so I used Sevin and wiped them out overnight with hundreds of them dead on the ground under my plants. This year I have been lucky with only minor problems with caterpillars. Just picking them off has been adequate most of the time and something seems to be eating them. I do have a lot of Assassin bugs on my tomatoes so maybe they eat them or maybe it is all the wasps flying around.
Bill
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