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The Influence of Soil Moisture on the Foliar Activity of Diclofop

Published online by Cambridge University Press:  12 June 2017

W. A. Dortenzio  and
R. F. Norris
W. A. Dortenzio
Affiliation:
Bot. Dep., Univ. of California, Davis, CA 95616
R. F. Norris
Affiliation:
Bot. Dep., Univ. of California, Davis, CA 95616
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Abstract

Loss in activity of foliar-applied methyl ester of diclofop {2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acid} occurred under low soil moisture conditions. A loss in control of yellow foxtail [Setaria lutescens (Weigel) Hubb.], wild oats (Avena fatua L.), little-seed canarygrass (Phalaris minor Retz.), and barnyardgrass [Echinochloa crus-galli (L.) Beauv.], was observed under greenhouse and growth chamber conditions. When soil was maintained at 2 to 3% above wilting point as compared to near field capacity, herbicide activity was decreased by 15 to 50%. High soil moisture (at or above 67% of field capacity) for at least 2 to 4 days following treatment was needed to achieve maximum effectiveness of the herbicide. Daily furrow irrigations for a period of 10 days following treatment of barnyardgrass in the field resulted in highest activity as compared to that under single irrigation regimes within the 10-day period. The effect of low soil moisture was minimized by increased rates of herbicide application. Hoe-29152 {methyl-2-[4-(4-trifluoromethylphenoxy)phenoxy] propanoate} showed similar losses in activity associated with low soil moisture. No consistent changes in uptake or translocation of 14C-labeled diclofop could be detected in association with altered soil moisture status.

Keywords

Beta vulgarisgrassesEchinochloa crus-gallidalapontranslocation
Type
Research Article
Information
Weed Science , Volume 28 , Issue 5 , September 1980 , pp. 534 - 539
Copyright
Copyright © Weed Science Society of America 

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References

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