Behaviour is Influenced by Volatiles from Both Plants and Nymphs.

(Waterston) is an important ectoparasitoid of the Asian citrus psyllid, Kuwayama, a globally destructive pest of citrus. In the present study, a Y-tube olfactometer was employed to investigate whether the parasitoid is capable of utilizing the odour source emitted by both plants and insect hosts during its foraging. The odour sources included (L.) shoots, 1st, 2nd, 3rd, 4th, and 5th instar nymphs, both individually and in combinations. Moreover, nymph-stage choice for parasitism, including 3rd, 4th, and 5th instar nymphs, was carried out. The results indicated that female were only significantly attracted to volatiles emitted by shoots, 3rd, 4th, and 5th instar nymphs of , but could not distinguish between them. males were not attracted by odours sourced from any instar nymphs. Female adults exhibited a significant preference to later instar nymphal stages of for oviposition. The results from this study can be used to guide further investigations on the searching behaviour of this parasitoid and its utilization in biocontrol.