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lookout after dark. In the greenhouse or conservatory, you could use the biological control Trichogramma brassicae, which is a tiny wasp that targets caterpillar eggs.The moment you find signs of caterpillars, spray the plants with pyrethrum.just about

one edge. Brush the clean edge of the card over the top of your plants - when the beetles hop into the air they'll stick to the grease. Repeat as necessary.Use pyrethrum chemical controls, or spray seedling brassicas with a thiacloprid insecticide

with the biological control Steinernema carpcapse.With heavy infestations, use an insecticide based on pyrethrum (only use once a season on crops).brassicas and nasturtiumsearly spring to autumnCommon problems when growing vegetables