The essential oil components from root part of Cirsium japonicum and oviposition-stimulatory activity against Ostrinia zealis by root essential oil were investigated. The main component of fresh root essential oil was aplotaxene (75.14%) and of dried root stock was found to be palmitic acid (14.42%). The root oil was significantly more active than the control against O. zealis.
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Miyazawa et al. (2003) studied this question.
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