Most caterpillars feed on plants of some kind, and some are pests in gardens and yards.
Some, such as the tent caterpillar can cause severe defoliation of trees and shrubs, while others, such as cabbage loopers, can cause the loss of a garden crop. Caterpillars are not always pests, however. If damage is not occurring, monitor regularly and do not apply treatments unless damage becomes apparent and at levels to high to live with. If you find caterpillars in your garden or yard and feel that they must be controlled, there are several non-toxic methods to choose from. If they are within reach and if the numbers are not too great, probably the easiest way to control them is to knock them into a can of soapy water.