Beet, Chard: Aphids
Photo by: A.L. Antonelli
Biology
Aphids are small, pear-shaped, soft-bodied insects. They may range in color from yellowish to dark green.
Aphids typically feed on the underside of leaves, sucking sap from the plant tissues. Aphid feeding can cause foliage to yellow, and leaves may wilt if infestations are severe.
Aphid feeding produces honeydew, a sweet, sticky material which may attract ants or become covered with a dark growth of sooty mold.
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 enemies 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.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Apply control measures when aphids first appear and repeat applications at 8- to 10-day intervals as needed.
- Soaps may require several applications.
- Thorough coverage of the foliage is important, including lower leaf surfaces.
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.
Additional Image
Photo by: R.S. Byther
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Evidence of noncompliance may be reported through your local Extension office.