Effects of Southwestern Pine Tip Moth and Vegetation Competition on Ponderosa Pine Growth
Abstract:The effects of southwestern pine tip moth Rhyacionia neomexicana (Dyar) and vegetation competition on ponderosa pine Pinus ponderosa (Doug. ex Laws) growth was studied in northern Arizona. Tip moth attack rates varied significantly among three sites. Weeding had little effect on attack rates but increased tree survival by 17%, height growth by 96%, and diameter growth by 83%. Insectidde treatment for tip moth control increased height growth 49% and diameter growth only 12%. High tree mortality rates in insecticide treated plots suggest a possible phytotoxic effect of the insecticide. Tree growth declined as tip moth attacks increased. Height growth was further reduced with each added year of tip moth attack. Diameter growth was less affected by multiple years of attack. For. Sci. 38(1):173-186.
Document Type: Journal Article
Affiliations: Professor, Northern Arizona University, School of Forestry, Box 4098, Flagstaff, AZ 86011
Publication date: February 1, 1992
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