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Behavior of Ips Populations After Summer Thinning in a Loblolly Pine Plantation

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The effects of summer thinning on the population behavior of Ips avulsus (Eichh.) and Ips grandicollis (Eichh.) were investigated in a loblloly pine plantation in Tennessee. Thinning attracted large numbers of both Ips species, which infested slash in the experimental area. Beetles that invaded the thinning did not attack living trees; they only colonized fresh slash. Window-trap collections of flying beetles were significantly correlated with the intensity of attacks on slash. The flight of I. avulsus into each new thinning was briefer and more intense than the flight of I. grandicollis. Daytime temperatures and light also strongly influenced the flight intensity of I. avulsus. Newly emerged beetles, instead of accumulating in the old thinning, dispersed to new sources of attraction. Dispersal of I. avulsus was much more rapid than that of I. grandicollis. It is concluded that in pulpwood stands in the mid-South, Ips are rarely a hazard to healthy living trees because of summer thinning.
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Keywords: Ips avulsus; Ips grandicollis; Pinus taeda; bark beetles; slash

Document Type: Journal Article

Affiliations: Forest Insect Ecologist, Pacific Northwest Forest and Range Exp. Sta., Forest Service, U.S. Dep. of Agr., Portland, Oreg.

Publication date: 1969-12-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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