1. Insect
  2. Hay and Pasture Crops
  3. Clover Hay Pests

Clover hay-Aphid

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Image related to Clover hay-Aphid
Pea aphid
Acyrthosiphon pisum Harris
Female adult immature
© Ken Gray Insect Image Collection

Includes

Clover aphid (Nearctaphis bakeri)
Pea aphid (Acyrthosiphon pisum)

Pest description and crop damage Clover aphid can be particularly problematic on red clover in the PNW. It is much smaller than the pea aphid, yellow in color, and builds up in spring from a few overwintered aphids that are under stipules. Large populations secrete copious amounts of honeydew which have been reported to increase the risk of secondary infections such as sooty mold on clover. They typically infest red, alsike, and Ladino clover. Winged forms disperse in May and June.

Management-chemical control

  • acetamiprid (Assail 30SG, Afflict 30SG, Verso 30SG, Assail 70WP, ArVida 70 WP, Omni Brand Acetamiprid 70 WP, Anarchy 70 WP, Verso 70 WP, Intruder MAX 70WP) at 0.047 to 0.075 lb ai/A. PHI 30 days. REI 12 hr. One application per year. Do not exceed 0.075 lb ai/A per year.
  • azadirachtin (Aza-Direct, Atrevia 3% SL)-Aza-Direct at 0.012 to 0.025 lb ai/A; Atrevia 3% SL at 0.019 to 0.03 lb ai/A. REI 4 hr. PHI 0 days. OMRI-listed for organic use.
  • azadirachtin and pyrethrins (Azera, Azera Pro) at 0.0125 to 0.0275 lb ai/A. REI 12 hr. PHI 0 days. Do not exceed 0.050 lb pyrethrins /A.
  • Beauveria bassiana GHA (BotaniGard ES, BoteGHA ES, Botanigard Optima ES, BoteGHA Optima ES, Mycotrol Optima ESO, Principle WP)-BotaniGard ES, BoteGHA ES at 0.25 to 1 quart in 5 to 100 gal water/A; Botanigard Optima ES, BoteGHA Optima ES, Mycotrol Optima ESO at 0.25 to 1.25 quarts in 5 to 100 gal water/A; Principle WP at 0.25 to 1 lb of product per 100 gal/A. Adjust water volume to ensure good coverage but avoid runoff. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • Chromobacterium subtsugae (Grandevo) at 2 to 3 lb product per 100 gal/A. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • flupyradifurone (Sivanto 200SL) at 0.091 to 0.183 lb ai/A. PHI 14 days. REI 4 hr. Retreatment interval 10 days. Do not exceed 0.365 lb ai/A per season.
  • malathion (Drexel Malathion 5EC, Malathion 57 EC, Fyfanon 57% EC, Martin's Malathion 57%, Gowan Malathion 8, Malathion 8-E)- Drexel Malathion 5EC, Malathion 57 EC, Fyfanon 57% EC, Martin's Malathion 57% at 0.94 to 1.25 lb ai/A; Gowan Malathion 8, Malathion 8-E at 1 to 1.25 lb ai/A. PHI 0 days. Limit 2 treatments per cutting. Retreatment interval 14 days. REI 12 hr.
  • zeta-cypermethrin (Mustang, Mustang Maxx, Cortes MAXX)-Mustang at 0.028 to 0.05 lb ai/A; Mustang Maxx or Cortes MAXX at 0.014 to 0.025 lb ai/A. PHI 3 days for cutting and grazing; 7 days for seed. REI 12 hr. Do not apply more than 0.05 lb ai per cutting or 0.15 lb ai per season of Mustang or 0.025 lb ai per cutting and 0.075 lb ai per season of Mustang Maxx or Cortes MAXX. Retreatment interval 7 days.

Management-biological control

  • beneficial aphid predators such as hoverflies, lady beetles, and lacewings