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Nantucket Pine Tip Moth Development and Population Dynamics: Influence of Nitrogen Fertilization and Vegetation Control

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It is commonly believed that Nantucket pine tip moth (Rhyacionia frustrana [Comstock]) feeding damage on loblolly pine (Pinus taeda L.) increases in relation to the intensity of silvicultural practices. Some studies have produced contrary or inconclusive data regarding this issue. This study was designed to examine the relationships between tree growth rates and tip moth development by enhancing growth with nitrogen (N) fertilizer and herbicide applications. The four treatments were N fertilizer, herbicide, herbicide+fertilizer, and untreated control. These treatments were monitored for tip moth damage levels, tip moth pupal numbers per pine shoot, insect population dynamics, and tree growth. Pine growth was significantly greater in the herbicide treatments than in the other treatments. There was a significant increase in diameter related to the fertilizer treatments, but no differences in tree height or volume were detected. Pupal weight was significantly lower in the herbicide treatment in the second year. Tip moth population fluctuations were greater in the herbicide treated plots than in the untreated control, and there were significant linear relationships between these fluctuations in the treatments versus percent parasitism, pupal weight, and diameter growth. This study shows that tip moth populations are not necessarily increased or decreased by intensive management practices, but can be less stable due to these practices. FOR. SCI. 49(5):731–737.
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Keywords: Pinus taeda; Rhyacionia frustrana; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; glyphosate; natural resource management; natural resources; silviculture

Document Type: Miscellaneous

Affiliations: 1: Entomologist Forest Health Protection, USDA Forest Service, Asheville, NC, 28804, Phone: 828-257-4326; Fax: 828-257-4856 jnowak@fs.fed.us 2: Research Forester Pacific Northwest Research Station, USDA Forest Service, Olympia, WA, 98512, Phone: 360-753-7674 tharrington@fs.fed.us 3: Professor Department of Entomology, University of Georgia, Athens, GA, 30602, Phone: 706-542-7888 berisford@bugs.ent.uga.edu

Publication date: 2003-10-01

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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