Bean: Bean aphids
K. Grey
Biology
Bean aphids are small, pear-shaped, dark green to black insects. These soft-bodied insects often feed in clusters on the shoot tips and leaves of new growth.
Severe infestations can result in curled or deformed leaves and shoot tips. Aphid feeding can produce large amounts of honeydew, a sweet, sticky material that may attract ants or become covered with a dark growth of sooty mold.
The summer form of the aphids may be found on various hosts including many vegetables, flowers, and ornamentals. The aphids typically overwinter on hosts such as euonymus and viburnum.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Encourage natural predators including ladybird beetles, lacewings, syrphid (hover) fly larvae, and parasitic wasps. Avoid use of broad-spectrum insecticides which kill beneficial insects.
- Hand-wipe or prune to control small, localized infestations (when practical).
- Wash aphids from plants with a strong stream of water.
- Control honeydew-feeding ants, which may protect aphid colonies from predators.
- Provide proper nutrition. High levels of nitrogen encourage aphid reproduction. Switch to a slow-release or low-nitrogen fertilizer if necessary.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Apply when aphids first appear.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.