Pest description and crop damage This is the common, large light-green aphid found on most legumes. Large populations weaken plants, secrete honeydew, and can reduce hay yield.
- malathion (Drexel Malathion 5EC) at 0.625 to 1.25 lb ai/a. PHI 0 days. REI 12 hr. Retreatment interval 14 days. Limit 2 treatments per cutting. Malathion is more effective at 65°F or above. If bees are in the field, apply malathion in late evening, after bees have returned to hives.
- zeta-cypermethrin (Mustang) at 0.028 to 0.05 lb ai/a. PHI 3 days for cutting or grazing, 7 days seed. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.05 lb ai/a per cutting nor 0.15 lb ai/a/season.