Adult and nymph: Dark green to bluish-black; up to 1/12 inch long; adults may be winged or wingless. Bean aphids cluster on stems and under leaves.
All beans. Also beet, carrot, corn and squash.
Leaves curl and thicken, plants become yellow and unthrifty. Aphids spread virus of common bean mosaic.
Throughout United States; infestations localized.
Localized aphid infestations can be hand-picked or pruned out. Before planting vegetables, check surrounding weeds and other plants for aphids and destroy where found. Remove any aphids discovered on transplants before planting. Always remove all crop residues immediatly after harvest.
Insecticidal soap, horticultural oil, or Neem oil. Many predators, such as lady beetles, damsel bugs, lacewing larvae, and flower fly larvae, and parasitic wasps help keep aphid populations in check.
Apply a registered insecticide when insects are first noticed.
Revised 3/28/2006
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