Cnephasia longana
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.
Management-chemical control
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.