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Home → Publications → Seed and Seedling Diseases in the Western US → Insects and Diseases of the Bridger-Derby, Deer Creek, and Iron Mountain Management Units Big Timber Ranger District, Gallatin National Forest Montana

Insects and Diseases of the Bridger-Derby, Deer Creek, and Iron Mountain Management Units Big Timber Ranger District, Gallatin National Forest Montana

Several insect and disease pests occur on the Bridger-Derby. Deer Creek. and Iron Mountain units of the Big Timber Ranger District. Of the known pests. the western spruce budworm (Choristoneura occidentalis Free.) has occurred at outbreak proportions for the past 10 years. The Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.). mountain pine beetle (Dendroctony~ pond~Losae Hopk.). and western balsam bark beetle (Dryocoetes confusus Sw.) have occurred at sub-outbreak status during the same period of time. Major diseases that are locally damaging include root diseases of Douglas-fir and dwarf mistletoe on lodgepole pine. Even though most areas are not extensively damaged by diseases. exceptions are in portions of the Iron Mountain unit where severe root diseases occur. At the request of the Forest. Cooperative Forestry and Pest Management prepared this report to (1) describe the current and potential insect and disease situation. (2) discuss probability of damage. and (3) provide recommendations for minimizing losses to various pests.


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Author(s): USDA Forest Service