Abstract
Abstract The volatile compounds produced by the leaves of Trifolium glanduliferum , T. strictum and T. subterraneum were collected by trapping on Tenax TA adsorbent and the major components were identified by GC–MS. The volatiles obtained from T. glanduliferum and T. strictum were shown to deter the redlegged earth mite ( Halotydeus destructor ) from feeding, whereas those from T. subterraneum did not. β-Ionone and coumarin, detected in the volatiles of T. glanduliferum , T. strictum , showed strong deterrent activity at 100 ppm. Phenylethanol, a component of the volatiles of T. strictum , was inactive.
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