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Droplet Size Impact on Efficacy of a Dicamba-plus-Glyphosate Mixture

Published online by Cambridge University Press:  14 March 2019

Thomas R. Butts*
Affiliation:
Current, Assistant Professor, Extension Weed Scientist, University of Arkansas System Division of Agriculture, 2001 Highway 70 E, Lonoke, AR, USA; Former, Graduate Research Assistant, Department of Agronomy and Horticulture, University of Nebraska-Lincoln, 402 West State Farm Road, North Platte, NE, USA
Chase A. Samples
Affiliation:
Extension Associate, Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS, USA
Lucas X. Franca
Affiliation:
Graduate Student, Department of Plant and Soil Sciences, Mississippi State University, PO Box 9555, Mississippi State, MS, USA
Darrin M. Dodds
Affiliation:
Associate Professor, Department of Plant and Soil Sciences, Mississippi State University, PO Box 9555, Mississippi State, MS, USA
Daniel B. Reynolds
Affiliation:
Professor, Department of Plant and Soil Sciences, Mississippi State University, PO Box 9555, Mississippi State, MS, USA
Jason W. Adams
Affiliation:
Research Specialist, Department of Plant Sciences, North Dakota State University, PO Box 6050, Fargo, ND, USA
Richard K. Zollinger
Affiliation:
Professor, Department of Plant Sciences, North Dakota State University, PO Box 6050, Fargo, ND, USA
Kirk A. Howatt
Affiliation:
Associate Professor, Department of Plant Sciences, North Dakota State University, PO Box 6050, Fargo, ND, USA
Bradley K. Fritz
Affiliation:
Agricultural Engineer, USDA-ARS Aerial Application Technology Research Unit, 3103 F&B Road, College Station, TX, USA
Clint W. Hoffmann
Affiliation:
Agricultural Engineer, USDA-ARS Aerial Application Technology Research Unit, 3103 F&B Road, College Station, TX, USA
Joe D. Luck
Affiliation:
Associate Professor, Department of Biological Systems Engineering, University of Nebraska-Lincoln, PO Box 830726, Lincoln, NE, USA
Greg R. Kruger
Affiliation:
Associate Professor, Department of Agronomy and Horticulture, University of Nebraska-Lincoln, 402 West State Farm Road, North Platte, NE, USA
*
Author for correspondence: Thomas R. Butts, University of Arkansas System Division of Agriculture, 2001 Highway 70 E, Lonoke, AR 72086 USA. (Email: tbutts@uaex.edu)

Abstract

Chemical weed control remains a widely used component of integrated weed management strategies because of its cost-effectiveness and rapid removal of crop pests. Additionally, dicamba-plus-glyphosate mixtures are a commonly recommended herbicide combination to combat herbicide resistance, specifically in recently commercially released dicamba-tolerant soybean and cotton. However, increased spray drift concerns and antagonistic interactions require that the application process be optimized to maximize biological efficacy while minimizing environmental contamination potential. Field research was conducted in 2016, 2017, and 2018 across three locations (Mississippi, Nebraska, and North Dakota) for a total of six site-years. The objectives were to characterize the efficacy of a range of droplet sizes [150 µm (Fine) to 900 µm (Ultra Coarse)] using a dicamba-plus-glyphosate mixture and to create novel weed management recommendations utilizing pulse-width modulation (PWM) sprayer technology. Results across pooled site-years indicated that a droplet size of 395 µm (Coarse) maximized weed mortality from a dicamba-plus-glyphosate mixture at 94 L ha–1. However, droplet size could be increased to 620 µm (Extremely Coarse) to maintain 90% of the maximum weed mortality while further mitigating particle drift potential. Although generalized droplet size recommendations could be created across site-years, optimum droplet sizes within each site-year varied considerably and may be dependent on weed species, geographic location, weather conditions, and herbicide resistance(s) present in the field. The precise, site-specific application of a dicamba-plus-glyphosate mixture using the results of this research will allow applicators to more effectively utilize PWM sprayers, reduce particle drift potential, maintain biological efficacy, and reduce the selection pressure for the evolution of herbicide-resistant weeds.

Type
Research Article
Copyright
© Weed Science Society of America, 2019. 

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Footnotes

Cite this article: Butts TR, Samples CA, Franca LX, Dodds DM, Reynolds DB, Adams JW, Zollinger RK, Howatt KA, Fritz BK, Clint Hoffmann W, Luck JD, Kruger GR (2019) Droplet size impact on efficacy of a dicamba-plus-glyphosate mixture. Weed Technol 33:66–74. doi: 10.1017/wet.2018.118

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