Alfalfa Caterpillar
Colias eurytheme Boisduval

Adults are butterflies with yellow or white wings having a black border. Larvae are velvety, green caterpillars up to 38 mm long. They have a narrow, white stripe on each side of the body through which runs a fine, pale red stripe. The larvae eat alfalfa leaves but seldom cause economic damage except in localized areas. Host plants: clover, alfalfa, other forage legumes.