Clover seed-Lesser clover leaf weevil

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 (Bifenture EC, Brigade 2EC, Capture 2EC, Discipline 2EC) at 0.06 to 0.1 lb ai/a. REI 12 hr. Do not apply while bees are present. Do not make more than 3 applications per crop year. Allow at least 21 days between treatments. Do not graze clover after application. 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 OR-040039, OR-070013, ID 080011, ID-040009, ID-070009, WA-040027, WA-070015.
  • chlorpyrifos (Lorsban Advanced) at 1.0 lb ai/a. This product is highly toxic to bees. Do not apply to clover in bloom. Do not make more than one application per crop year. REI 24 hr. Do not graze clover after application. 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 OR-090010. Oregon only.
  • phosmet (Imidan 70-W) at 0.93 lb ai/a. Do not apply when bees are present. Spray weevil larvae during active feeding. Do not apply more than once per season. Do not graze clover after application. Do not cut treated clover for hay or forage. Processed seed must be labeled. 24c SLN ID-990024. Idaho only.