Clover seed-Spider mite

Includes

Strawberry spider mite (Tetranychus turkestani)
Twospotted spider mite (T. urticae)

Pest description and crop damage Pests are not insects but rather eight-legged arachnids less than 0.03 inch long. West of the Cascades, most mite problems in clover seed fields begin during postbloom or early seed set, when only heavy infestations justify control. East of the Cascades, overwintering mites that are colonizing a new crop sometimes are abundant. These may lay enough eggs to be a problem before bloom.

Management-chemical control

  • bifenazate (Acramite- 4SC) at 0.5 lb ai/a. PHI 7 days. Only 1 application is allowed per year. Rotate to a product with a different mode of action grouping if additional applications are needed. 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-120007. Oregon only.
  • bifenthrin (Bifenture EC, Brigade 2EC, Discipline 2EC, Fanfare 2EC, Fanfare ES, Tundra EC) at 0.06 to 0.1 lb ai/a. 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. REI 12 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-960021, OR-040039, OR-070013, OR-170012, ID-080011, ID-900006, ID-040009, ID-070009, ID-060023, ID-130004, WA-040027, WA-070015.
  • malathion at 1 to 1.25 lb ai/a. Apply to plants in bloom only in evening or early morning, when bees are not working in the fields or hanging on the outside of the hives.
  • oxydemeton-methyl (MSR Spray Concentrate) at 0.375 to 0.5 lb ai/a. PHI 21 days. REI 15 days. Chaff from seed crop may be used for feed or forage, but do not cut green crop for these purposes. Do not apply more than two times per crop cycle. Wait a minimum of 14 days between applications. Apply by air, chemigation or groundboom.
  • propargite (Comite) at 1.64 to 2.46 lb ai/a. REI 2 to 7 days. 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-080017, ID-770005, WA-040019.