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Loblolly Pine Conelet, Cone, and Seed Losses to Insects and Other Factors in a Louisiana Seed Orchard

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Abstract:

Insects destroyed 75 percent of developing loblolly pine cones and caused an additional 10 percent reduction in seed yield of the surviving cones. Coneworms, Dioryctria spp., were responsible for most of the destruction, killing 56.7 percent of the cones. Other insects responsible for lesser amounts of damage were the seedbugs Tetrya bipunctata (H & S) and Leptoglossus corculus (Say), the Nantucket pine tip moth Rhyacionia frustrana (Comstock), and a thrips, possibly Gnophothrips fuscus (Morgan). More than 88 percent of the total damage occurred in 1973 during the first 6 months of conelet development. Damage to cones in 1974 was attributed almost entirely to Dioryctria spp. Radiographs of seed from surviving cones revealed that seedbug feeding accounted for the 10 percent seed loss, and seedworms, Laspeyresia spp., less than 1 percent. Damage by the various pest species to the different clones was not significantly different when analyzed statistically. Forest Sci. 22:386-391.

Keywords: Dioryctria spp; Gnophothrips fuscus; Laspeyresia spp; Leptoglossus corculus; Pinus taeda; Rhyacionia frustrana; Tetrya bipunctata

Document Type: Journal Article

Affiliations: Staff Forester, Louisiana Forestry Commission, Woodworth 71485

Publication date: December 1, 1976

More about this publication?
  • 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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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