Relationship Between Cortical Monoterpenes and Susceptibility of Eastern White Pine to White-Pine Weevil Attack

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Abstract:

Cortical monoterpene composition of 590 eastern white pines (Pinus strobus L.) from 27 geographic seed sources originating throughout the species range and of varying susceptibility to repeated white-pine weevil (Pissodes strobi Peck) attack was examined. Groups of trees, categorized by number of successful weevil attacks sustained (leader killed) after 3, 7, and 11 years following termination of chemical control when the trees were 12 years old, differed significantly in mean alpha-pinene and limonene concentrations. Alpha-pinene concentration was significantly higher in trees that were not successfully attacked than in trees within other categories through the first 7 years. Limonene concentration was consistently lowest in trees that were not successfully attacked and highest in trees attacked most frequently. Almost 72 percent of the trees that were successfully attacked less than 3 out of 11 years had limonene concentrations below the population median. More than 64 percent of the trees with the highest concentrations of limonene had been successfully attacked in at least 5 years during the same time interval. Trees with both low limonene and high alpha-pinene concentrations were the least susceptible as a group. Concentrations of these two monoterpenes could be useful criteria in indirect selection for reducing susceptibility to weevil attack. Forest Sci. 26:581-589.

Keywords: Pinus strobus; Pissodes strobi

Document Type: Journal Article

Affiliations: Research Plant Geneticist, USDA Forest Service, Northeastern Forest Experiment Station, Forestry Sciences Laboratory, Durham, New Hampshire 03824

Publication date: December 1, 1980

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