Abstract
Cucurbitacin E and cucurbitacin I have been isolated from green parts of Iberis amara and identified by TLC, UV and MS. It is shown that cucurbitacins act as feeding inhibitors for the flea beetle Phyllotreta nemorum. The most potent feeding inhibitors in green parts of I. amara towards P. nemorum are cucurbitacin E and I, and the concentrations of these compounds in the plant are found to be high enough to prevent feeding of the flea beetle.
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