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Notes: Clonal Variation in Susceptibility to Coneworms (Dioryctria spp.) in Young Loblolly Pine Seed Orchards

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Twenty-five loblolly pine seed orchards were examined for coneworm damage over a 3 year period. Eight of the twenty-five orchards were found to have significant clonal variation in coneworm infestation rates. Susceptibility among those eight orchards ranged from 0 to 67 percent infested cones. Infestation rates were not correlated with performance values for height or diameter. Selection against susceptible clones or "custom-designed" insecticide treatments may successfully reduce this pest problem and minimize the need for large scale orchard-wide chemical control measures. Yields from untreated orchards may have genetic compositions and economic values that differ greatly from original expectations. The degree of difference is dependent upon the number of clones contained in the orchard and the performance levels of the infested trees. Forest Sci. 31:794-798.

Keywords: Pinus taeda; roguing; selection

Document Type: Miscellaneous

Affiliations: Research Entomologist, USDA Forest Service, Forestry Sciences Laboratory, Athens, GA 30602

Publication date: September 1, 1985

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