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Southern Pine Beetle Infestation Development: Interaction Between Pine and Hardwood Basal Areas

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We evaluated the interactive effects of pine and hardwood basal areas on stand susceptibility to southern pine beetle during 2 yr. Low and high pine basal areas (12 vs. 25 m²/ha, respectively) and presence and absence of hardwoods (11 rs. 2 m²/ha, respectively) were represented in a 2 x 2 factorial experiment replicated in four blocks of 30-40-year-old pine stands during 1989 and 1990. Infestations were initiated by introducing bolts containing southern pine beetle pupae and callow adults from two infested trees into each experimental plot. Bolts were placed around a baited tree that provided a focus for attack. During both years the dense, pure pine treatment showed significantly greater infestation growth than the other treatments, killing an average of 9 trees during 1990 and 6 trees for the 2 yr combined. Infestations in the other treatments killed, on average, only the baited tree. These results demonstrated experimentally that thinned stands are less susceptible to southern pine beetle and that hardwoods apparently do not increase susceptibility but may interfere with infestation growth. Implications of these results for forest management are discussed. FOR. SCI. 39(2):201-210.

Keywords: Dendroctonus frontalis; forest management; insect; resource concentration

Document Type: Journal Article

Affiliations: USDA Forest Service, Southern Forest Experiment Station, Pineville, LA 71360

Publication date: 1993-05-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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