Evaluation of Douglas-fir beetle infestations, North Fork Clearwater River Drainage, Idaho, 1974

dc.date	2006-11-08T15:39:03Z
dc.date	2006-11-08T15:39:03Z
dc.date	1975
dc.date.accessioned	2013-10-16T07:41:43Z
dc.date.available	2013-10-16T07:41:43Z
dc.date.issued	2013-10-16
dc.identifier	http://hdl.handle.net/1957/3334
dc.identifier.uri	http://koha.mediu.edu.my:8181/xmlui/handle/1957/3334
dc.description	Douglas-fir beetle, Dendroctonus pseudotsugae Hopk., has caused extensive tree mortality in the North Fork Clearwater River drainage since 1971. In 1974, survey estimates indicated a continued decline in the infestation. Average group size decreased from a high of 158 trees per group in 1971 to 17 in 1974. Average area occupied by each group declined from a high of 4.1 acres per group in 1972 to 0.65 acre in 1974. Attack densities decreased; however, brood-to-parent ratios increased. Natural enemies are having a limited impact on population densities. Availability of susceptible host material may be the primary limiting factor on increased infestation potential. Continued salvage logging of infested trees and susceptible stands is encouraged.
dc.language	en_US
dc.publisher	Missoula, MT : USDA, Forest Service, Northern Region, Division of
dc.relation	Report (United States. Forest Service. Northern Region)
dc.relation	no. 75-11
dc.relation	Forest environmental protection
dc.title	Evaluation of Douglas-fir beetle infestations, North Fork Clearwater River Drainage, Idaho, 1974
dc.type	Technical Report

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