EFFECT OF TIME-OF-YEAR ON CUT STUMP GLYPHOSATE TREATMENT OF RUSSIAN OLIVE (ELAEAGNUS ANGUSTIFOLIA) IN EAST-CENTRAL UTAH
Applied Research
Ronald Patterson
Horticulture/Agriculture Educator
University of Idaho
Idaho Falls
Abstract
\r\n Russian olive is an invasive, woody species that is overtaking riparian areas and pastures in the Western United States. Studies show that diversity of avian and mammalian species decrease as Russian olive replaces native vegetation. Its thorns discourage livestock grazing and are hazardous to humans and farm equipment. A frequent treatment in western pastures is to simply remove the trees with heavy equipment. The result is shrubby, sucker growth. For effective initial control the roots must be killed, which will require either regular tillage or chemical application. The label of one glyphosate product states, “For best results, [cut stump] applications should be made during periods of active growth and full leaf expansion.” The major concern with the growing season application is that farmers and ranchers are busiest during that time of year, so Russian olive control is moved toward the bottom of the list of things to do. This field trial was to determine which times of year a cut stump application of glyphosate would be most effective. From December 2009 through November 2010, six Russian olive trees were cut down each month. Three stumps were immediately treated with undiluted 41% glyphosate herbicide applied to the cambium layer at the rate of 1 cc herbicide per inch of trunk diameter. Three stumps were untreated controls. The results indicate that 100% dormant and growing season control can be achieved with cut stump treatments of glyphosate on Russian olive, thus allowing farmers and ranchers more time to schedule Russian olive control.
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Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.
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Authors: R.K. Patterson, D.E. Worwood
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Patterson, R. Extension Assistant Professor, Utah State University, Utah, 84501
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Worwood, D. Extension Faculty, Utah State University, Utah, 84513