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, Assail 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, Neemix 4.5) at 0.012 to 0.025 lb ai/A. REI 4 hr. PHI 0 days. OMRI-listed for organic use.
- Beauveria bassiana GHA (Mycotrol ESO, BoteGHA ES) at 0.25 to 1 quart in 5 to 100 gal water/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) at 0.94 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)-Mustang at 0.028 to 0.05 lb ai/A (Mustang); 0.014 to 0.025 lb ai/A (Mustang Maxx). 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. Retreatment interval 7 days.
Management-biological control
- beneficial aphid predators such as hoverflies, lady beetles, and lacewings