Eggs are round, white to cream colored and laid on the undersides of leaves.
The alfalfa looper is more widespread and destructive than the cabbage or celery loopers. Larvae feed on leaves causing ragged- edged holes in the leaf and on the leaf margins. The major damage caused by larvae and pupae is contamination of the heads of cole crops and severe defoliation of alfalfa, peas, sugarbeets, beans, mint and spinach. In peas, the larvae curl up and are a contaminant in processing. This pest is distributed throughout the United States and parts of Canada.