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North American Ecology (US and Canada)

Resident across Canada, much of the western United States, and the US Northeast and mid-west (Scott 1986). Habitats are SHADED STREAMSIDES. Host plants are usually herbaceous. Host plants include many species, but mostly in one family, CRUCIFERAE. Eggs are laid on the host plant singly. Individuals overwinter as pupae. There is a variable number of flights based on latitude each year with one flight occuring approximate JUN1-AUG1 in the northern and higher altitude parts of the range; two or three spring-summer flights elsewhere, and a first flight occuring FEB1-APR1 in coastal California. (Scott 1986).


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