The essential oils hydrodistilled from the aerial parts of Echinacea purpurea (L.) Moench grown at the Herb Garden of Casola Valsenio (Ravenna, Italy) from healthy and infected (cucumber mosaic cucumovirus; CMV) plant materials, were analyzed by GC/MS. The oil from healthy material was rich in germacrene D (57.8%) and was more abundant. The infected materials afforded a lower oil content and significant quantitative variations in the oil composition. In particular, the observed percentage of germacrene D (52.6%) was reduced as were other sesquiterpene hydrocarbons. These variations, tested to be significant for all the compound-class fractions and individual major components, were ascribed to the CMV infection, the only fixed-effect variable that might affect the oil composition.
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Hudaib et al. (2002) studied this question.
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