Pest description and crop damage Larvae are gray grubs that feed underground, on roots and crowns, from October through May. Older larvae may feed above ground on stems and leaves during the night. Large numbers can thin stands in old pastures and kill seedlings in new stands.
- Baythroid XL, Warrior and Mustang have given effective control of these pests when applied to control other labeled pests that occur at the same timing as for these products. Research in OR has shown them to be effective on this particular pest when used at higher-range label rates for other pests. Oregon and Washington only.
- chlorantraniliprole+lambda-cyhalothrin (Besiege) at 0.59 to 0.88 lb ai/a. PHI 1 day for forage, 7 days for hay. Retreatment interval 7 days. REI 12 hr. Do not exceed 0.09 lb ai/a lambda-cyhalothrin and 0.2 lb ai/a chlorantraniliprole.
- gamma-cyhalothrin (Declare) at 0.01 to 0.015 lb ai/a. PHI 0 days for grazing or 7 days cut for forage. REI 24 hr. Do not exceed 0.45 lb ai/a per season.
- lambda-cyhalothrin (Warrior II) at 0.02 to 0.03 lb ai/a. PHI 0 days for grazing and forage; 7 days for hay. REI 24 hr. Do not exceed 0.03 lb ai/a per cutting or 0.09 lb ai/a per season.
- methyl parathion (Methyl 4EC) at 0.5 to 0.75 lb ai/a. PHI 15 days. Apply when larvae are small. Irrigate after application or allow rain to wash into crown. REI 4 day.