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Nonchemical and Herbicide Treatments for Management of Japanese Stiltgrass (Microstegium vimineum)

Published online by Cambridge University Press:  20 January 2017

Jeffrey Stuart Ward  and
Todd L. Mervosh
Jeffrey Stuart Ward*
Affiliation:
Department of Forestry and Horticulture, Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven, CT 06504
Todd L. Mervosh
Affiliation:
Valley Laboratory, Connecticut Agricultural Experiment Station, 153 Cook Hill Road, Windsor, CT 06095
*
Corresponding author's E-mail: jeffrey.ward@ct.gov
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Abstract

Japanese stiltgrass, an annual grass species native to eastern Asia, has become a serious invasive-plant problem in the eastern United States. We compared the efficacy of herbicides and nonchemical options found effective for controlling stiltgrass in earlier studies, with organic herbicides and herbicides used at reduced rates in a wooded floodplain along the lower Connecticut River. We compared the effect of 2 yr of conventional and alternative treatments on cover of other nonnative and native species. Four blocks of 18 plots (3 by 4 m [9.8 by 13.1 ft]) were established in May 2008. Treatments included directed heating with a propane torch (June, July), hand-pulling (July), mowing with a string trimmer (July, August), foliar applications of household vinegar [5% acetic acid] (June, July) and the herbicides imazapic (June), pelargonic acid (June, July), and pelargonic acid plus pendimethalin (June). The following herbicides were applied at labeled doses and at one-fourth labeled doses: fenoxaprop-p-ethyl (July), glufosinate (August), and glyphosate (August). Stiltgrass cover and height were evaluated periodically, and plant samples were collected in autumn of 2008 and 2009 to determine the number of viable seeds produced. Final evaluations were conducted in June 2010 after 2 yr of treatment. Stiltgrass cover averaged 88% on untreated plots in fall. All treatments reduced stiltgrass cover and seed production. The least-effective treatments were hand-pulling, pelargonic acid, and vinegar in July. Direct heating, mowing, and vinegar in June reduced seed production by more than 90%. All treatments containing imazapic, pelargonic acid plus pendimethalin, fenoxaprop-p-ethyl, glufosinate, and glyphosate completely prevented stiltgrass seed production in the second year of treatment. Effective control of stiltgrass can be achieved during a 2-yr period with a variety of herbicides, including herbicides at one-fourth of the labeled dose, and through nonchemical treatments.

Keywords

Fenoxaprop-p-ethylglufosinateglyphosateimazapicpelargonic acidpendimethalinJapanese stiltgrass, Microstegium vimineum (Trin.) A. Camus var. imberbe (Nees) HondaNepalese browntoppropane torchmechanical controlherbicideinvasive plantseed productionvinegar
Type
Research
Information
Invasive Plant Science and Management , Volume 5 , Issue 1 , March 2012 , pp. 9 - 19
Copyright
Copyright © Weed Science Society of America 

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