Abstract
A methanol extract of Castela emoryi was active as both a preventive and a curative agent against grape downy mildew infestation. 15-Glucopyranosylglaucarubolone (1) was identified as the active constituent. In the same assay holacanthone (2) was found to be phytotoxic and glaucarubolone (3) was inactive
Published Version
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