Author:
Duncan David N.,Meggitt William F.,Penner Donald
Abstract
Differences in susceptibility of sugarbeet (Beta vulgarisL.) 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 andsec-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 of14C-ethofumesate,14C-desmedipham [ethylm-hydroxycarbanilate carbanilate (ester)], and14C-ethofumesate +14C-desmedipham was observed in plants that received preemergence treatments of ethofumesate plus TCA compared to pyrazon or a control.
Publisher
Cambridge University Press (CUP)
Subject
Plant Science,Agronomy and Crop Science
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