Impact of egg viability, egg parasitism, and virus on 1975 Douglas-fir tussock moth defoliation potential in the lower Flathead Valley, Montana

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Citeable URL: https://ir.library.oregonstate.edu/concern/defaults/n296x051p

Descriptions

Attribute Name	Values
Creator	Tunnock, Scott United States. Forest Service. Northern Region. State & Private Forestry
Abstract	Evaluation of Douglas-fir tussock moth, Orgyia pseudotsugata, egg masses collected from an outbreak area in the lower Flathead Valley indicated that overall egg viability was relatively high, egg parasitism was low, and virus infestation averaged 7.1 percent northwest of Polson, 17.9 percent south of St. Ignatius, and 57.0 percent west of Ravalli. In the three areas, a total of 2,240 acres may be visibly defoliated in 1975, and light defoliation may be scattered over an additional 5,600 acres. The outbreak is expected to decline due to natural causes by the end of 1975.
Resource Type	Technical Report
Date Available	2006-11-08T15:24:06+00:00
Date Issued	1975
Series	Forest environmental protection (Missoula, Mont.)
Subject	Douglas fir -- Diseases and pests -- Flathead River Valley (B.C. and Mont) Douglas fir tussock moth -- Flathead River Valley (B.C. and Mont)
Rights Statement	Copyright Not Evaluated
Publisher	Missoula, MT. : Forest Environmental Protection, USDA, Forest Service, Northern Region, State & Private Forestry
Language	English [eng]
File Format	application/pdf
File Extent	6472887 bytes
Digitization Specifications	Scanned at 600 DPI using a Cannon DR-9080C in TIF format. PDF generated through Capture Perfect using OmniPage Professional 15 for textual OCR.
Replaces	http://hdl.handle.net/1957/3332

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