Impact of the Western Spruce Budworm on Buds, Developing Cones and Seeds of Douglas-Fir in the Intermountain Region
The western spruce budworm, Choristoneura occidentalis Freeman (Lepidoptera: Tortricidae), is a serious defoliator of conifers in the western U.S. and western Canada. In 1985 epidemic levels of the budworm caused average tree defoliation in west-central Idaho to increase to 83%, up substantially fro...
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| Format: | Others |
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DigitalCommons@USU
1986
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| Online Access: | https://digitalcommons.usu.edu/etd/7301 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=8398&context=etd |