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Portland Trees

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phone: (503) 823-TREE (8733)

email: trees@portlandoregon.gov

1900 SW 4th Avenue, Portland, OR 97201

Aphids

Description   

Susceptible species

Treatment

Additional information


Description

Aphids are small, pear-shaped insects that feed on plant sap and excrete sugary honeydew. Honeydew is the waste material excreted by aphids, and this sticky substance can quickly cover a car or landscaping underneath infected trees. Aphids can be green, yellow, black, brown or red and be winged or unwinged. Aphids usually feed in groups and do not move rapidly when disturbed. When a tree is infested with aphids, leaves and the ground under the tree will be covered with honeydew and a black, sooty mold could grow on it. It is best to check susceptible trees often, such as twice a week, to catch aphid infestations early.

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Susceptible species

Lindens and tulip trees

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Treatment

Spray leaves with water to mechanically remove aphids, or treat the tree with insecticides. 

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Additional information