erysimum crepidifolium/silica

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Cardenolides fromErysimum cheiranthoides: Feeding deterrents toPieris rapae larvae.

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Larvae of the cabbage butterfly,Pieris rapae, refuse to feed on the wild mustard,Erysimum cheiranthoides, due to the presence of alcoholextractable deterrents. The active components were extracted inton-BuOH, and this extract was separated into four fractions (I-IV) by reverse-phase HPLC. Fractions

Isolation and identification of oviposition deterrents to cabbage butterfly,Pieris rapae, fromErysimum cheiranthoides.

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Avoidance of some crucifer species by the crucifer specialist,Pieris rapae, has been attributed to the presence of oviposition deterrents in these plants. Studies on one such unacceptable plant,Erysimum cheiranthoides, have resulted in the isolation ofn-butanol-soluble deterrents from the alcoholic

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