Silvicultural Control of Ponderosa Pine Dwarfmistletoe in South-Central Oregon--A Five-Year Study
Twelve 0.05-acre experimental plots were estalished in 1957 near Bly, Oregon to implement investigation of silvicultural control of ponderosa pine drawfmistletoe. Treatments consisted of (A) no treatment, (B) removal of infected overstory with no understory treatment, (C) no overstory treatment but sanitation of the understory by thinning and pruning, and (D) sanitation of both overstory and understory. Initially, 56 percent of the trees (67 percent of the basal area) were infected. Incidence of dwarfmistletoe in understory trees increased with d.b.h. Five years of annual sanitation of thinned plots have not eliminated dwarfmistletoe but the incidence has been much reduced and tree growth greatly enhanced. Suitable chemicals are urgently needed to augment silvicultural treatments for eradication of dwarfmistletoe.
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Document Type: Journal Article
Affiliations: Forest Pathologist, Weyerhaeuser Company, Forestry Research Center, Centralia, Wash.
Publication date: 1964-12-01
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