Insect & Disease Resource Center
Search Results
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Ash Flower Gall
Ash flower gall is a symptom of feeding activity of microscopic mites known as ash flower gall mites.
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Boxwood Insects and Mite Pests
There are three types of insects and mites that attack boxwoods Boxwood psyllid, Boxwood leafminer and Boxwood spider mites.
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Boxwood Leafminer
Boxwood Leafminer are small flies that attack several varieties of boxwood, causing the usually dense foliage to appear weak and lackluster. These pests can kill boxwood twigs and cause mature plants to become susceptible to other diseases, including winter-kill in colder climates.
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Cedar Rust
There are multiple rust fungi that affect cedars (junipers): cedar-quince rust, cedar-hawthorn rust and cedar-apple rust. All of these rusts require two different hosts and alternate between them during the year. Cedar-quince rust appears as elongated branch swellings that produce orange spores.
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Cherry Bark Tortrix
The cherry bark tortrix (CBT) moths are major pests in the Pacific Northwest, where they affect rosaceous trees and shrubs. Affected plants include apple, crabapple, hawthorn, Mountain ash, pear and Photinia species. Prunus species are the preferred hosts.
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Diplodia Tip Blight
Diplodia tip blight of pines (formerly known as Sphaeropsis tip blight) is caused by the fungus Diplodia pinea. The fungus can live in dead needles, branches, and cones of the tree all year round.
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Eriophyid Mites
Eriophyid mites are the smallest arthropod pests on plants. Two common eriophyid mites are ash flower gall mite (Eriophyes fraxiniflora) and pine bud mite/needle sheath mite (Trisetacus pini). Because the mites have relatively short mouthparts, they feed on cells just under the plant surface and may cause galls, witches broom and browning or yellowing of leaves or needles.