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Influence of Bentazon on the Phytotoxicity of Paraquat to Peanuts (Arachis hypogaea) and Associated Weeds

Published online by Cambridge University Press:  12 June 2017

Glenn Wehtje ,
John W. Wilcut  and
John A. McGuire
Glenn Wehtje
Affiliation:
Dep. Agron. and Soils, and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
John W. Wilcut
Affiliation:
Dep. Agron., Box 748, Coastal Plain Exp. Stn., Univ. Georgia, Tifton, GA 31794-0748
John A. McGuire
Affiliation:
Res. Data Analysis and Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

Bentazon reduced paraquat phytotoxicity to Texas panicum, sicklepod, Florida beggarweed, and peanut. Bentazon applied alone had minimal effect on these species. Smallflower morningglory was more sensitive to bentazon than to paraquat; the interaction of paraquat and bentazon varied from antagonistic to synergistic depending upon the specific combination of rates. Antagonism with tank-mixed combinations was also obtained by applying bentazon prior to paraquat, but not with the reverse. Studies with 14C-labeled herbicides revealed that each herbicide inhibited foliar penetration of the other. In field studies, adding bentazon to paraquat reduced crop injury. However, except for smallflower morningglory, weed control was also reduced.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin- 4(3H)-one 2,2-dioxideparaquat, 1,1′-dimethyl-4,4′-bipyridinium ionFlorida beggarweed, Desmodium tortuosum (Sw.) DC # DEDTOsicklepod, Cassia obtusifolia L. #CASOBsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb #IAQTATexas panicum, Panicum texanum Buckl. #PANTEpeanut, Arachis hypogaea L.AbsorptionantagonismsynergismtranslocationCASOBDEDTOIAQTAPANTE
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 90 - 95
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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