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Influence of Temperature and Relative Humidity on the Activity of Acifluorfen

Published online by Cambridge University Press:  12 June 2017

Ronald L. Ritter  and
Harold D. Coble
Ronald L. Ritter
Affiliation:
Dep. Agron., Univ. of Maryland, College Park, MD 20742
Harold D. Coble
Affiliation:
Crop Science Dep., North Carolina State Univ., Raleigh, NC 27650
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Abstract

The influence of temperature and relative humidity on the activity of acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} on common cocklebur (Xanthium pensylvanicum Wallr.) and common ragweed (Ambrosia artemisiifolia L.) was studied in growth chambers. Treatment at high relative humidity (85 ± 5%) resulted in a significant increase in acifluorfen phytotoxicity and decrease in plant dry weight as compared to treatment at a lower (50 ± 5%) relative humidity (RH). Temperature (32 C day, 22 C night or 26 C day, 16 C night) was not as critical as relative humidity in influencing acifluorfen phytotoxicity. Addition of a non-ionic surfactant to the herbicide solution resulted in increased phytotoxicity. Penetration and translocation of acifluorfen in common cocklebur were increased when applications were made at high relative humidity.

Keywords

Penetrationtranslocationdiphenylether herbicide
Type
Research Article
Information
Weed Science , Volume 29 , Issue 4 , July 1981 , pp. 480 - 485
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

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