Inhibition of Epicuticular Wax Deposition on Cabbage by Ethofumesate

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Abstract
The weight of epicuticular wax on the surface of cabbage (Brassica oleracea var. Capitata ''Market Prize'') leaves was reduced by soil treatments of ethofumesate (2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonate) and EPTC (S-ethyl diprophylthiocarbamate). Separation of epicuticular wax into major components by GLC indicated that ethofumesate decreased the deposition of n-nonacosane and n-nonacosan-15-one on cabbage leaves but increased the deposition of a minor component, the long chain waxy esters. EPTC was less inhibitory to n-nonacosan-15-one deposition than was ethofumesate. EPTC did not increase long chain waxy ester deposition. Scanning electron micrographs revealed that ethofumesate almost totally eliminated the epicuticular wax on cabbage leaves while EPTC only diminished it. Cuticular transpiration was increased by ethofumesate but not by EPTC. Ethofumesate appears to be a more potent inhibitor of epicuticular was deposition than EPTC.