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Glyphosate Translocation and Efficacy Relationships in Red Maple, Sweetgum, and Loblolly Pine Seedlings

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Glyphosate herbicide was applied to red maple, sweetgum, and loblolly pine seedlings at the end of the second growing season to evaluate the effects of application timing and water stress on glyphosate absorption, translocation, and efficacy. Although there was no difference in 14C-glyphosate absorption among species, sweetgum translocated significantly more herbicide to the roots and stem below the treated leaf than red maple and loblolly pine. These differences may explain, in part, the variability among species in susceptibility to glyphosate. Application timing and water stress had an interacting effect on red maple and loblolly pine efficacy. Increasing water stress resulted in decreased efficacy in August, but had no consistent effect in September and October, possibly due to physiological changes associated with the development of fall dormancy. Glyphosate was most phytotoxic to sweetgum, followed by loblolly pine and red maple, which corresponds to results observed in commercial pine release applications. For. Sci. 36(2):438-447.
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Keywords: Herbicide application timing; water stress

Document Type: Journal Article

Affiliations: Research Associate, Dept. of Forestry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

Publication date: 1990-06-01

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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