Diameter Increment of Ponderosa Pine Infected with Dwarfmistletoe in South-Central Oregon
Diameter increments for the past 50 years were determined at breast height for 128 ponderosa pines in two areas in south-central Oregon. Four levels of infection with dwarfmistletoe and four tree-age classes were studied. Following statistical analyses, area data were pooled and organized so that infection classes were limited to two--light and severe, and age classes to three--young, immature, and mature. Diameter increment was found to decrease with increase in age and in level of infection. Striking reduction in diameter increment accompanied severe dwarfmistletoe infections in all age classes but especially in young trees. An allied study showed that infection accompanied by brooming is associated with greater reductions of diameter and height growth than is comparable infection without brooming. Young trees now broomed were at one time the larger trees but have been overtaken by uninfected trees.
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Document Type: Journal Article
Affiliations: Forest Pathologist, Weyerhaeuser Company, Forestry Research Center, Centralia, Wash.
Publication date: 1964-10-01
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