Cabbage white caterpillar

The velvety green caterpillars of the white cabbage moth chew irregular holes in brassica leaves and hide along the leaf midribs.

Green caterpillars (often along veins), ragged holes, and dark green droppings on leaves. White butterflies fluttering over the bed.

Pick off caterpillars by hand, or spray with Bt (Dipel), a caterpillar-specific biological control that spares other insects.

Cover crops with fine netting, plant decoy nasturtiums nearby, and inspect leaf undersides for eggs.