Effects of environment and host genetics on Eucosma sonomana (Lepidoptera: Tortricidae) infestation levels
1998
Prueitt, S.C. | Ross, D.W.
Infestations of the western pine shoot borer Eucosma sonomana Kearfott, in young stands of ponderosa pine, Pinus ponderosa Lawson, were surveyed on the Deschutes National Forest in central Oregon. Elevation, slope, aspect, tree height, tree diameter, number of shoots in the terminal whorl, stand density, stand age, and plant association for each stand were used in logistic regression analyses to predict the percentage of infested terminal shoots. The best model included number of shoots in the terminal whorl and stand age. Values for these stand characteristics can be used with the appropriate equation to predict the percentage of terminal whorls damaged by shoot borer in a given stand. A companion study conducted at 6 progeny test sites on the Ochoco National Forest in eastern Oregon found significant differences in shoot borer infestations among 29 ponderosa pine half-sib families.
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