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Is there anything that kills them, my purple sprouting today, also on sprouts , cabbage , caulie !!!!!! ( North Worcestershire)
One article I read on them suggested that the caterpillars are susceptible to dying in prolonged periods of wet weather!
I have found caterpillars of the Diamondback moths. They are much much smaller and less destructive than cabbage white caterpillars and there also seem to be less of them. They often don't leave complete holes in the leaves, rather they leave patches of damaged leaves where it seems they have just scraped the leaf leaving a brown/grey dead spot. When they mature, they don't make a normal chrysalis, but instead spin themselves in to a little web in an indentation on the leaf - easily confused for something a spider could make. Even at their biggest they don't get bigger than a large grain of rice.I only found mine after cooking some broccoli! They were everywhere in the florets and it was pretty disgusting finding all these cooked caterpillars.