Filbert: Filbert aphid
Photo by: A.L. Antonelli
Biology
Filbert aphids are small, yellowish-green, pear-shaped insects typically found on the leaves. Aphids are often found in colonies on the tender new growth.
Heavy aphid feeding may result in stunting and distortion of leaves and shoots. Severe infestations may cause foliage to show signs of water stress.
Filbert aphids produce honeydew, a sweet, sticky material which may attract honeydew-feeding ants or become covered with a growth of dark 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 predatorsincluding ladybird beetles, lacewings, syrphid (hover) fly larvae, and parasitic wasps. Avoid use of broad-spectrum insecticides which kill these beneficial insects.
- Hand-wipe or prune to control small, localized infestations when practical.
- Wash aphids from tree 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 :
- Esfenvalerate is toxic to bees.
- Do not apply products containing esfenvalerate on or near blooming plants.
- To minimize risk to bees, apply in the evening after bees have stopped foraging for the day.
- Homeowners should not make foliar applications to trees over 10 ft tall.
- Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.
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.