Glyphosate-Resistant Horseweed (Conyza canadensis) Control with Dicamba inAlabama

Michael L. Flessner; J. Scott McElroy; James D. McCurdyJordan M. ToombsGlenn R. WehtjeCharles H. BurmesterAndrew J. PriceJoyce T. Ducar

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Glyphosate-Resistant Horseweed (Conyza canadensis) Control with Dicamba inAlabama

机译：Glyphosate-Resistant Horseweed (Conyza canadensis) Control with Dicamba inAlabama

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The development and spread of glyphosate-resistant (GR) horseweed has increased the use of dicamba as an alternative herbicide treatment. Research evaluated suspected glyphosate-resistant horseweed populations from DeKalb (GR-1) and Cherokee (GR-2) counties, Alabama, for response to glyphosate, dicamba, and glyphosate + dicamba. Populations used for resistance determination were tested at rosette and bolt growth stages. Glyphosate resistance evaluation treatments ranged from 0 to 36.0 kg ae ha~(-1).Data confirmed that GR-1 and GR-2 horseweed populations were 3.0 to 38 times more resistant to glyphosate than the susceptible population, according to population, data type, and growth stage at treatment. GR-1 and GR-2 populations were further evaluatedfor response to dicamba. Dicamba was applied at 0 to 1.12 kg ai ha~(-1), both with and without the addition of glyphosate at 1.12 kg ae ha~(-1). All populations had similar tolerance to dicamba, with the exception of GR-2 treated at the rosette growth stage, which had -^2-fold greater tolerance. When glyphosate was tank-mixed with dicamba, the response of GR populations was similar to that of dicamba alone. Therefore, any potential resistance-management benefit of tank-mixing dicamba with glyphosate may be negated when one is attempting to control GR horseweed. Conversely, adding glyphosate to dicamba drastically enhanced control of the susceptible population at both growth stages.

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《Weed technology: A journal of the Weed Science Society of America》 |2015年第4期|633-640|共8页
作者
Michael L. Flessner; J. Scott McElroy; James D. McCurdyJordan M. ToombsGlenn R. WehtjeCharles H. BurmesterAndrew J. PriceJoyce T. Ducar;
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作者单位

Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Blacksburg, VA 24060;

Undergraduate Research Assistant, Professor, Agronomist, and Assistant Professor, Department of Crop, Soil and Environmental Sciences, Auburn University, 201 Funchess Hall, Auburn University, AL 36849;

Mississippi State University, 117 Dorman Hall, Mississippi State University, MS 39762National Soil Dynamics Laboratory, U.S. Department of Agriculture, Agricultural Research Service, 411 South Donahue Drive, Auburn University, AL 36849;

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正文语种英语
中图分类植物保护;
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GR horseweed; dicamba; herbicide resistance.;

Glyphosate-Resistant Horseweed (Conyza canadensis) Control with Dicamba inAlabama

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