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Effect of Pyrithiobac, MSMA, and DSMA on Cotton (Gossypium hirsutum L.) Growth and Weed Control

Published online by Cambridge University Press:  12 June 2017

C. Dale Monks ,
Michael G. Patterson ,
John W. Wilcut  and
Dennis P. Delaney
C. Dale Monks*
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849
Michael G. Patterson
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849
John W. Wilcut
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
Dennis P. Delaney
Affiliation:
Department of Agronomy and Soils and Alabama Cooperative Extension Service, Auburn University, Auburn, AL 36849
*
Corresponding author's E-mail: cmonks@acesag.auburn.edu.
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Abstract

Field experiments were conducted at one location in Georgia (1994) and at two locations in Alabama (1994 and 1995) to evaluate the effects of MSMA or DSMA plus pyrithiobac applied postemergence (POST) in cotton. Pyrithiobac at 0.07 kg ai/ha was applied POST alone or in combination with MSMA at 1.1 kg ai/ha or DSMA at 1.7 kg ai/ha at the pinhead square stage of cotton growth. Cotton was tolerant to the POST applications of pyrithiobac. Adding MSMA or DSMA to pyrithiobac injured cotton similar to MSMA or DSMA applied alone. Plant mapping data indicated that all treatments had no effect on height : node ratio, reproductive or vegetative node production, or square retention at the first or second fruiting position. Cotton maturity response to MSMA and DSMA ranged from no effect to delayed maturity. Adding DSMA to pyrithiobac increased Florida beggarweed and common cocklebur control over pyrithiobac applied alone in 1995 but did not increase control in 1994. Adding DSMA to pyrithiobac increased sicklepod control over pyrithiobac applied alone in the three site years it was rated in the Alabama tests. Where sicklepod is present, the addition of an arsenical herbicide to pyrithiobac will generally increase control but has the potential to delay maturity and decrease cotton yield equal to the arsenical herbicide applied alone.

Keywords

DSMA, disodium methanearsonateMSMA, monosodium methanearsonatepyrithiobac, 2-chloro-6-[(4,6-dimethoxy-2-pyrimidinyl)thio]benzoic acidcommon cocklebur, Xanthium strumarium L. # XANSTFlorida beggarweed, Desmodium tortuosum (SW.) DC. # DEDTOsicklepod, Senna obtusifolia (L.) Irwin & Barneby # CASOBcotton, Gossypium hirsutum L.Growth responseplant mappingDP, Delta and Pine LandHNR, height : node ratioPOST, postemergenceWAP, weeks after plantingWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 6 - 11
Copyright
Copyright © 1999 by the Weed Science Society of America 

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