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- W284909252 abstract "The mountain pine beetle reached epidemic levels in second-growth 80-yearoldponderosa pine stands on the Ninemile Ranger District in 1969. Theoutbreak increased through 1971 and spread over 30,000 acres. Heavyinfestation occurred on about 2,600 acres within this area. A two-stagesurvey was used during 1972 and 1973 to stratify the infestation, andobtain tree and volume loss estimates. This survey shows that about109,284 trees were killed with an estimated volume loss of 613,743 boardfeet from 1970 to 1973. The outbreak has been declining since 1971. Surveysthis year point toward a continued decline. However, some hot spotinfestations will persist in pure,overstocked,second-growth stands. Commercialthinning is encouraged to release the stand, promote tree growth, and changethe microenvironment, making it unattractive to mountain pine beetle." @default.
- W284909252 created "2016-06-24" @default.
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- W284909252 date "1974-03-31" @default.
- W284909252 modified "2023-09-27" @default.
- W284909252 title "Mountain pine beetle impact survey, Ninemile Drainage, Lolo National Forest, and state and private lands, Montana, 1973" @default.
- W284909252 hasPublicationYear "1974" @default.
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