This is the caterpillar to a cabbage white butterfly. So they are an introduced pest in this part of the world. At present the geraniums at work are infested with the dratted things, at home my poor veggie patch has been somewhat decimated by the little monsters. Easy and eco friendly way to keep them out of your veggie patch, use Flour (plain or self raising, doesnt really matter). Dust the leaves of the plant theyre attacking with it and if you can, dust both sides of the leaves. Its more effective if the leaves are a little damp when you do this. You will need to reapply after rain, etc, but the caterpillars eat the flour and it swells inside them and kills them. So you dont have to worry about a snow ball effect of poison if something decides to feast on the dead caterpillars. It wont kill the entire populous but it will knock down the number enough for your veggie patch to recover. Good luck.
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