Defoliating insects of western larch in the northern Rocky Mountains, 1957
Denton RE. 1958. Defoliating insects of western larch in the northern Rocky Mountains, 1957. Missoula Forest Insect Laboratory. Missoula, MT
Late in the summer of 1955 scattered reports of defoliation in western larch stands were received from various forest personnel in the region. During the next year, general examinations were made from the air and ground to determine the extent of the outbreaks and the several insects responsible. In 1957, an increase in severity of existing infestations and the introduction of another new defoliator of larch into Idaho necessitated an expansion of the survey program to include more detailed information on defoliator conditions in western larch. Ground surveys showed four species of insects to be epidemic: the larch budmoth, larch casebearer, a "larch looper", and the two-lined larch sawfly. The infestations of each of these defoliators are described in this report. Montana, Yellowstone National Park, Wyoming, and parts of Idaho, Washington, and North Dakota, are the areas covered in this report.
- Type
- Published Report
- Authors
- Denton, Robert
- Date of Issue
- 1958-02
- Publisher
- Missoula Forest Insect Laboratory
- Units
- GLAC , YELL
- Keywords
- Animal Studies, Disease, Ecology, Forest, Infestations, Insects and Arachnids, Invertebrates, larch budmoth (Zeriaphera diniana), Plant Studies, Trees, western larch (Larix occidentalis)