There are many types of caterpillars that attack crops. They are the larval stage of moths and butterflies,such as cabbage moth, cabbage white butterfly, potato moth or tomato moth. The moths lay their eggs on the underside of leaves. The larvae of caterpillars hatch from the eggs and then feed on the leaves or other plant parts. Holes are seen in the leaves or fruit. Holes are usually irregular in shape. Black or brown droppings can also be an indication of the presence of caterpillar.