*Now at Department of Zoology, University of Ruhuna, Matara, Sri Lanka.
Reactions of adult female parasitoids, particularly Aphidius rhopalosiphi, to volatile chemical cues from the host plants of their aphid prey
Article first published online: 13 MAR 2008
Volume 17, Issue 3, pages 297–304, September 1992
How to Cite
WICKREMASINGHE, M. G. V. and EMDEN, H. F. V. (1992), Reactions of adult female parasitoids, particularly Aphidius rhopalosiphi, to volatile chemical cues from the host plants of their aphid prey. Physiological Entomology, 17: 297–304. doi: 10.1111/j.1365-3032.1992.tb01025.x
- Issue published online: 13 MAR 2008
- Article first published online: 13 MAR 2008
- Accepted 25 November 1991
- Aphid parasitoids;
- Aphidius rhopalosiphi;
- host plant odours;
- wheat volatiles
Abstract. In Y-tube olfactometer tests, Aphidius ervi Hal., Trioxyssp., Praon sp., Aphelinus flavus (Nees), Lysiphlebus fabarum (Marsh.) and Aphidius rophalosiphi De Stef. responded positively to the odour of the plant on which aphid mummies containing them had been collected. The response to host plant odour was greater than the response to the odour of host aphids, their honeydew or a combination of the two. The strongest response was to a combination of plant and host aphids. A. rhopalosiphi showed a strong positive response to three wheat volatiles (cis-3-hexenyl acetate, cis-3-hexen-1-ol and trans-2-hexenal) as well as to indole-3-acetaldehyde (a breakdown product of tryptophan in aphid honeydew). In both olfactometer tests with odours and choice trials with whole plants, newly emerged A. rhopalosiphidistinguished and preferred the variety of wheat on which their development had occurred to other wheat varieties.