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Douglas Fir - 100 Most Common North American Trees

By , About.com Guide

5 of 5

Insects and Diseases of Douglas Fir
Doug Fir Stands

Doug Fir Stands

Steve Nix/About.com
Pest information courtesy of USFS Fact Sheets
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Pests: Aphids infestations on small trees may be dislodged with a strong stream of water from the garden hose. Scale and bark beetles may infest Douglas-Fir, especially those under stress.

Diseases: Root rot can be a serious problem on clay and other wet soils. Needles infected by leaf cast fungi in spring turn brown and fall off. Several fungi cause canker diseases leading to branch dieback. Maintain tree health and prune out infected branches.

More on Tree Insects and Disease

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