Hypera nigrirostris
Pest description and crop damage Green or brown weevils about 1 inch long. Larvae feed under basal leaf sheath, tunnel in stem, and feed on florets in developing flowers. Mainly a pest of red and alsike clover.
Management-chemical control
- bifenthrin (Brigade 2EC) at 0.06 to 0.1 lb ai/A. REI 12 hr. Do not apply to blooming crop or allow to drift while bees are actively visiting bloom. Do not make more than 3 applications per crop year. Allow at least 21 days between treatments. Do not graze clover after applying. Do not cut treated clover for hay or forage. Do not use harvested seed for sprouting. No part of the treated field, including seed, seed screenings, hay, forage, or stubble, may be used for human or animal feed. Processed seed must be labeled. 24c SLN: Brigade 2EC, OR-070013 (expires 12/31/2028), ID-070009 (expires 12/31/26. Oregon and Idaho only.
- chlorantraniliprole at 0.047 to 0.098 lb ai/A. PHI 0 days. REI 4 hr. Do not make more than 4 applications per calendar year. Do not apply more than 0.2 lb ai/A per calendar year.