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A thermal application range for postemergence pyrithiobac applications

Published online by Cambridge University Press:  20 January 2017

Ginger G. Light ,
Peter A. Dotray  and
James R. Mahan
Peter A. Dotray
Affiliation:
Department of Plant and Soil Science, Texas Tech University, Box 42122, Lubbock, TX 79409-2122
James R. Mahan
Affiliation:
Plant Stress and Water Conservation Laboratory, USDA-ARS, 3810 Fourth Street, Lubbock, TX 79415-3397
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Abstract

Pyrithiobac control of Palmer amaranth on the Texas Southern High Plains was correlated previously with temperature at the time of application. In the present study, the thermal dependence of pyrithiobac efficacy was used to define a thermal application range (TAR) for postemergence pyrithiobac applications. Several years of temperature data from four cotton-growing regions of the United States were analyzed with respect to the TAR to determine the extent to which temperature limitations could affect pyrithiobac applications. Temperatures outside the TAR occurred in all years and regions analyzed. Analyses of four geographic regions utilizing 4 to 11 yr of data for each region indicated the following percentages of hours inside the TAR: Lubbock, TX, 54 to 94%; Maricopa, AZ, 27 to 33%; Raleigh-Durham, NC, 70 to 97%; and Jackson, MS, 81 to 99%. A detailed analysis of the frequency and duration of the TAR in Lubbock, TX, showed that, periodically, temperatures outside the TAR may limit the efficacy of postemergence pyrithiobac applications for several consecutive days. Finally, the TAR was shown to be useful as a postapplication diagnostic tool for evaluating herbicide applications that resulted in poor efficacy. These results suggest that long-term evaluation of historic temperatures with respect to the TAR for a given herbicide may provide insight into the potential limitations of herbicide efficacy and underscore the potential utility of developing TARs based on field and laboratory analyses of herbicide thermal dependence.

Keywords

Pyrithiobaccotton, Gossypium hirsutum L.Palmer amaranth, Amaranthus palmeri S. Wats. AMAPAAcetolactate synthasecomputer visualizationprobability-based analyses
Type
Research Article
Information
Weed Science , Volume 49 , Issue 4 , August 2001 , pp. 543 - 548
Copyright
Copyright © Weed Science Society of America 

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