Differences in Insect Infestation in Slash Pine Seed Orchards Due to Phorate Treatment and Clonal Variation

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Soil applications of 0.1 lb., 0.5 lb., and 1.0 lb. per tree of phorate active ingredient were made early in April in three slash pine seed orchards in Alabama, Georgia, and Florida. The treatments were replicated by clones. Only in one orchard was there some control of all the major cone and seed insects: the 1.0 lb. treatment reduced infestation or damage by Dioryctria spp., Laspeyresia spp., thrips, and seedbugs by more than 80 percent and increased the percentage of filled seed harvested. Elsewhere only Laspeyresia spp. infestation was significantly reduced. Lower dosages also reduced Laspeyresia infestation in all three orchards, but were less effective. No foliar phytotoxicity was observed nor did phorate treatments increase the frequency of aborted seed, abnormal seedlings, or reduce full-seed germination. In each orchard there were significant differences between clones in both insect attack and full-seed germination. The seedbugs, Leptoglossus corculus (Say) and Tetyra bipunctata (H.+S.), accounted for major losses of 4.7 to 20.8 percent of the total seed harvested. Forest Sci. 18:56-64.

Keywords: Dioryctria; Gnophothrips; Laspeyresia; Leptoglossus; Pinus elliottii; Tetyra

Document Type: Journal Article

Affiliations: Research Forester, Woodlands Research Dept., Union Camp Corp., Rincon, Ga.

Publication date: March 1, 1972

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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