Jeff Hahn, University of Minnesota
Size: Up to 1 1/2 inches long
Where/When: Found on cabbage as well as broccoli, asparagus, spinach, potato, and tomato. It also attacks flowers, such as aster and hydrangea. Active in Minnesota during early summer and again in late summer.
Significance: The larvae feed on leaves and can potentially defoliate plants although they are typically not an important problem in gardens.