The cocoon is white, loose, and net-like. They indicated that this was not as important to the developing pupa but did affect egg development and fertility in females. The forewings are ash colored or approaching black in coloration. The forewing has a large triangular white marking with smaller white markings. The hindwings are gray approaching black in color.
Adults have two flight peaks.
The second peak occurs at night and ends at the onset of light. Flight activity is increased when adults are ready to mate and when leek plants are detected. Diadromus pulchellus , a parasitic wasp. This wasp is not known to occur in Hawaii. They found that there was little difference in pest control cost between a sampling-based treatment program and routine application of insecticide.