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Basis for Increased Activity from Herbicide Combinations with Ethofumesate Applied on Sugarbeet (Beta vulgaris)

Published online by Cambridge University Press:  12 June 2017

David N. Duncan ,
William F. Meggitt  and
Donald Penner
David N. Duncan
Affiliation:
Pestic. Res. Center, Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
William F. Meggitt
Affiliation:
Pestic. Res. Center, Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
Donald Penner
Affiliation:
Pestic. Res. Center, Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
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Abstract

Differences in susceptibility of sugarbeet (Beta vulgaris L.) to preemergence application of ethofumesate [(±)-2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonate], pyrazon [5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone], and TCA (trichloroacetic acid) were evaluated in several combination treatments. Exposure of plants to ethofumesate severely decreased epicuticular wax deposition on leaf surfaces. Separation of epicuticular wax into major components by gas-liquid chromatography indicated that ethofumesate decreased deposition of alkanes and sec-ketones, but increased the percentage of long-chain waxy esters. TCA also decreased deposition of alkane and ketone components, but not of waxy esters. Waxes were unaffected by pyrazon. Greater foliar absorption of 14C-ethofumesate, 14C-desmedipham [ethyl m-hydroxycarbanilate carbanilate (ester)], and 14C-ethofumesate + 14C-desmedipham was observed in plants that received preemergence treatments of ethofumesate plus TCA compared to pyrazon or a control.

Keywords

Epicuticular waxpyrazonTCAdesmedipham
Type
Research Article
Information
Weed Science , Volume 30 , Issue 2 , March 1982 , pp. 195 - 200
Copyright
Copyright © Weed Science Society of America 

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References

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