Cabbage worms. I can see them in the picture. If you just pick them off it should make a big difference.
this post was submitted on 15 Jul 2023
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If you're amenable to using other methods, Sevin dust will kill them as well. If you want to go organic, try BT or neem oil -- FWIW, neem oil is also useful against other things, like fungal infections.
Thank you!