抄録
The olfactory responses of the big-eyed bugs Piocoris varius and Geocoris proteus towards kidney bean leaves infested with Tetranychus urticae were observed in an olfactometer. Adult females of P. varius showed a significant preference for T. urticae-infested leaves over clean air. Neither predator showed any significant preference for uninfested leaves, artificially damaged leaves or spider mites plus their products over clean air. Second-instar nymphs of P. varius and adult females of G. proteus did not discriminate between T. urticae-infested leaves and clean air, irrespective of previous exposure to odors from T. urticae-infested leaves. These results indicated that adult females of P. varius exploit herbivore-induced plant volatiles in their search for prey, whereas this was not true for 2nd-instar nymphs of P. varius or adult females of G. proteus.
