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Temperature and Relative Humidity Effects on Diphenylether Herbicides

Published online by Cambridge University Press:  12 June 2017

Rex A. Wichert ,
Robert Bozsa ,
Ronald E. Talbert  and
Lawrence R. Oliver
Rex A. Wichert
Affiliation:
Tech. Rep., Valent U.S.A. Corp., Fayetteville, AR 72701
Robert Bozsa
Affiliation:
Tech. Rep., Valent U.S.A. Corp., Fayetteville, AR 72701
Ronald E. Talbert
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Lawrence R. Oliver
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
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Abstract

The influence of temperature and relative humidity on the activity of acifluorfen, fomesafen, lactofen, and acifluorfen plus bentazon on prickly sida, pitted and entireleaf morningglory, and common cocklebur was evaluated in a growth chamber. Reduced control of all species was observed at 50% relative humidity as compared to 85% relative humidity when temperatures were higher (32/55 C day/night). Similar response to relative humidity was observed at the lower temperature (25/15 C) when treatments were applied 14 days after emergence (DAE). Changes in temperature at the same relative humidity did not alter herbicidal activity. Delaying application timing from 7 to 14 DAE decreased control by all herbicides except lactofen applied at high relative humidity, which controlled prickly sida at both 7 and 14 DAE.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidbentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidefomesafen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsulfonyl)-2-nitrobenzamidelactofen, (±)-2-ethoxy-1-methyl-2-oxoethyl 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoatecommon cocklebur, Xanthium strumarium L. ♯ XANSTentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray ♯ IPOHGprickly sida, Sida spinosa L. ♯ SIDSPpitted morningglory, Ipomoea lacunosa L. ♯ IPOLAEnvironmental factorsacifluorfenbentazonfomesafenlactofenSida spinosaIpomoea lacunosaIpomoea hederacea var. integriusculaXanthium strumariumSIDSPIPOLAIPOHGXANST
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 19 - 24
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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