none Agrotis ipsilon; CHEMICAL-SIGNALS; Kairomone, hexane extract sensitivity of hymenopteran parasite; HYMENOPTERAN-PARASITES; Meteorus rubens; Sensitivity of parasite to kairomone extract Meteorus rubens; CHEMORECEPTION-; Sensitivity to lepidopteran host kairomone extract; LEPIDOPTERAN-HOSTS; Agrotis ipsilon; Sensitivity to host kairomone extract The braconid parasitoid Meteorus rubens (Nees) is a gregarious larval parasitoid of Agrotis ipsilon (Hufn.). An olfactometer was used to check the attractiveness of the parasitoid to Hexane extract (kairomone) of its host that could be used in conjunction with releases of natural enemies. Female wasps are attracted in high numbers to the kairomone, compared with males. Respective rates of 94.3 and 22.3% are reported. In the control (no kairomone was used), the corresponding figures are 5.7 and 3.3%.