Pest description and crop damage Larvae are about 0.625 inch long when mature, with a tan head; the body is yellowish or gray with a lighter stripe on each side of the back.
This is a pest of vetch; occasionally it attacks wheat heads in fields where vetch grows. It is most common west of the Cascades.
Damage rarely is enough to justify chemical control, except in the Willamette Valley of Oregon. Some insecticides are registered in Oregon to control this pest; see labels for rates.