Pine: Pine aphid
categories: Conifers Ornamentals Pine Pine Insects
last review date: 2025-10-14 02:51
Photo by: R. Portman
Biology
Pine aphids are long-legged dark green or brown aphids covered with a white, woolly material. They are found in colonies on the needles.
The aphids produce large amounts of honeydew (a sweet, sticky material) which is often covered by a black growth of sooty mold.
Heavy aphid infestations may cause trees to turn yellowish but otherwise cause only minor damage.
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!
- Avoid use of broad-spectrum insecticides which kill predators and parasites, including ladybird beetles, green lacewings, and parasitic wasps.
- Reduce levels of nitrogen in foliage to decrease aphid reproduction. Switch to a slow-release or low-nitrogen fertilizer.
- Prune and destroy heavily infested branches.
- Hose aphids from trees with a strong stream of water, when practical.
Chemical Management
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.
- Thorough coverage of the foliage is important, including thorough penetration of needle clusters.
- Apply one of the following if aphids begin to build up.
- 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
Examples of pesticides that are legal for home use in Washington State are listed below.
The list may not include all products registered for this use.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.