The possible effects of environmental stress on plant chemistry that are important to herbivorous insects were examined by growing a wild crucifer, Erysimum cheiranthoides, under different nutrient regimes. Oviposition by the cabbage butterfly, Pieris rapae, is thought to be affected by the balance
Wormseed mustard,Erysimum cheiranthoides, is unacceptable as a host for the cabbage butterfly,Pieris rapae. However, it is preferred for oviposition byPieris napi oleracea in the greenhouse. Isolation and identification of the oviposition stimulants toP. napi oleracea were accomplished by C18