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Home → Publications → Seed and Seedling Diseases in the Western US → Evaluation of Insects and Diseases within Selected Forest Stands on the Nez Perce and Coeur D'Alene Indian Reservation, Idaho

Evaluation of Insects and Diseases within Selected Forest Stands on the Nez Perce and Coeur D'Alene Indian Reservation, Idaho

Selected forest stands within the Nez Perce and Coeur d'Alene Indian Reservations in northern Idaho were evaluated for current insect and disease activity. Root diseases were the major pest problems on both Reservations. Large mortality centers caused by Phellinus weirii and Armillaria mellea occurred on the Coeur d'Alene Reservation; scattered Armillaria root disease was common on the Nez Perce Reservation. Other diseases observed included Elytroderma needle cast and western gall rust on ponderosa pine, dwarf mistletoe on Douglas-fir, and decay caused by the Indian paint fungus on grand fir. Major insects included mountain pine beetle on lodgepole pine and pine engraver and western pine beetle on ponderosa pine. Fir engraver and Douglasfir beetle were associated with root diseased grand fir and Douglas-fir, respectively. Management strategies to reduce future losses are discussed.


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Author(s): USDA Forest Service