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Alder (Alnus)-Aphid Includes Alder aphid (Pterocallis alni) Hop aphid (Phorodon humuli) Woolly aphid (including leafcurl ash aphid, Prociphilus fraxinifolii) Pest description and damage Mature alder aphids are about 0.05 inch in length and pale yellow wit ...

Alder (Alnus)-Tent caterpillar Forest tent caterpillar (Malacosoma disstria) Western tent caterpillar (Malacosoma californica) Pest description and damage The western tent caterpillar attacks a wide variety of plants including alder, ash, birch, cottonwoo ...

Andromeda (Pieris japonica)-Azalea bark scale Eriococcus azaleae Pest description and damage Scale insects are small (less than 0.125 inch in length) soft insects that live beneath protective wax scales. These insects are often identified by the shape and ...

Andromeda (Pieris japonica)-Lace bug Azalea lace bug (Stephanitis pyrioides) Rhododendron lace bug (Stephanitis rhododendri) Pest description and damage These insects use piercing-sucking mouthparts to feed on individual plant cells on the lower leaf surf ...

Andromeda (Pieris japonica)-Root weevil Numerous species Pest description and damage Species identification is important as root weevil species differ in their susceptibility to pesticides and seasonal appearance of life stages. Adult weevils are 0.2 to 0 ...

Apricot, flowering (Prunus)-Fall webworm Hyphantria cunea Pest description and damage These gregarious caterpillars spin web-like tents in branch tips of deciduous trees including apple, cherry, peach, pecan, English walnut, black walnut, ash, boxelder, b ...

Apricot, flowering (Prunus)-Peachtree borer Synanthedon exitiosa Pest description and damage Peach tree borer is native to North America and common in the Pacific Northwest. The adult is a metallic blue-black, clearwing moth. The male moth with a 1-inch w ...

Apricot, flowering (Prunus)-Peach twig borer Anarsia lineatella Pest description and damage Peach twig borer is a European insect first found in California in the 1880s. It is a major pest of apricots, peaches, plums, and prunes. There are no native hosts ...

Apricot, flowering (Prunus)-Spider mite Includes twospotted spider mite (Tetranychus urticae) and others Pest description and damage Several species of spider mites can cause damage to apricot. Appearance of these mites varies with the species, although a ...

Arborvitae (Thuja)-Cypress tip moth Includes Argyresthia cupressella and others Pest description and damage There are nine different Argyresthia species that attack different conifers (pine, hemlock, etc.) in the Pacific Northwest. The cypress tip moth (o ...