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Weed Control with Halauxifen-Methyl Applied Alone and in Mixtures with 2,4-D, Dicamba, and Glyphosate

Published online by Cambridge University Press:  18 September 2018

Marcelo Zimmer Open the ORCID record for Marcelo Zimmer [Opens in a new window] ,
Bryan G. Young  and
William G. Johnson
Marcelo Zimmer*
Affiliation:
Graduate Research Assistant, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
Bryan G. Young
Affiliation:
Professor, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
William G. Johnson
Affiliation:
Professor, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
*
Author for correspondence: Marcelo Zimmer, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907. (E-mail: [email protected])
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Abstract

Synthetic auxin herbicides such as 2,4-D and dicamba are often utilized to control broadleaf weeds in preplant burndown applications to soybean. Halauxifen-methyl is a new synthetic auxin herbicide for broadleaf weed control in preplant burndown applications to corn, cotton, and soybean at low use rates (5 g ae ha–1). Field experiments were conducted to evaluate efficacy and weed control spectrum of halauxifen-methyl applied alone and in mixtures with 2,4-D (560 g ae ha–1), dicamba (280 g ae ha–1), and glyphosate (560 g ae ha–1). Glyphosate-resistant (GR) horseweed was controlled with halauxifen-methyl applied alone (90% control) and in mixtures (87% to 97% control) 35 d after treatment (DAT). Common ragweed was controlled 93% with halauxifen-methyl applied alone and 91% to 97% in mixtures 35 DAT. Halauxifen-methyl applied alone resulted in poor giant ragweed control 21 DAT (73% control); however, mixtures of halauxifen-methyl with 2,4-D, dicamba, or glyphosate controlled giant ragweed (86% to 98% control). Halauxifen-methyl alone resulted in poor redroot pigweed control (62% control) 21 DAT; however, mixtures of halauxifen-methyl with dicamba, 2,4-D, or glyphosate controlled redroot pigweed (89% to 98% control). Halauxifen-methyl controls GR horseweed and common ragweed applied alone and in mixtures with other synthetic auxin herbicides and glyphosate. Furthermore, mixing 2,4-D or dicamba with halauxifen-methyl can increase the weed control spectrum in preplant burndown applications.

Keywords

Amit Jhala, University of Nebraska, Lincoln2,4-Ddicambaglyphosatehalauxifen-methylcommon ragweed, Ambrosia artemisiifolia L. AMBELgiant ragweed, Ambrosia trifida L. AMBTRhorseweed, Conyza canadensis (L.) Cronq. ERICAredroot pigweed, Amaranthus retroflexus L. AMAREcorn, Zea mays L.cotton, Gossypium hirsutum L.soybean, Glycine max (L.) MerrBurndown broadleaf controlspring preplant applicationsynthetic auxins
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 32 , Issue 5 , October 2018 , pp. 597 - 602
Copyright
© Weed Science Society of America, 2018 

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