Skip to Main Content
Reduction in growth of pole-sized ponderosa pine related to a pandora moth outbreak in Central Oregon.Author(s): P.H. Cochran
Source: Res. Note PNW-RN-526. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 14 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
View PDF (90 KB)
DescriptionDefoliation by pandora moth in a ponderosa pine spacing study in 1992 and 1994 generally increased as spacings increased from 2 to 5.7 meters and then decreased as spacings increased to 8 meters. Defoliation did not increase mortality during the 1990-94 period, but volume growth was reduced. Basal area increments of sample trees were reduced 25 percent the first growing season after defoliation (1992), 30 percent the second year after defoliation (1993), and 63 percent after the second defoliation (1994
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationCochran, P.H. 1998. Reduction in growth of pole-sized ponderosa pine related to a pandora moth outbreak in Central Oregon. Res. Note PNW-RN-526. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 14 p
KeywordsPonderosa pine, pandora moth, defoliation, growth loss
- A ponderosa pine-lodgepole pine spacing study in central Oregon: results after 20 years.
- Seven chemicals fail to protect Ponderosa pine from Armillaria root disease in central Washington.
- A ponderosa pine-grand fir spacing study in central Oregon: results after 10 years.
XML: View XML