Hypera nigrirostris
Pest description and crop damage Green or brown weevils are about 0.125 inch long. Larvae feed under the basal leaf sheath, tunnel in the stem, and feed on florets in developing flowers. This pest typically prefers red clover. It is seldom a severe problem.
Management-chemical control
- malathion (Drexel Malathion 5EC) at 0.94 to 1.25 lb ai/A. PHI 0 days. Limit 2 treatments per cutting. Retreatment interval 14 days. REI 12 hr. Do not apply more than 2.5 lb ai per acre per calendar year.