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Portland Trees

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phone: (503) 823-TREE (8733)

email: trees@portlandoregon.gov

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Emerald Ash Borer

Description

Susceptible species

Treatment

Additional information


Description

Emerald ash borers are beetles that get their name because adults are a bright, metallic green. The beetles cause canopy thinning and dieback because they disrupt the tissues that conduct water and nutrients in the tree. The beetles leave characteristic “D”-shaped exit holes in the bark, approximately 1/8-inch in diameter, when they emerge in late May/June. Heavy infestations can kill a tree in a couple of years. Emerald ash borer has been found in the Midwest and east coast and has not made it to Oregon or the west coast yet.

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Susceptible species

Ash trees

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Treatment

Insecticides can be used to control emerald ash borer

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Additional information