Frass mediated host finding behaviour of Cotesia flavipes was studied utilizing a T-tube olfactometer. In a no-choice situation C. flavipes females were attracted strongly to the arm containing the larval frass of Chilo partellus. Per cent attraction to the larval frass obtained through feeding different host plants ranged from 75 to 64 % and these were not significantly different from all getting attracted to the frass containing arm. Attraction to larval washings was just 35% and significantly different from all getting attracted to the arm. In a paired-choice test, larval frass obtained from feeding on maize was most attractive followed by sorghum and bajra. Nutrition; Diet; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Land zones; Oriental region; Eurasia; Asia; India Chilo partellus (Pyralidae); Food plants; Hymenopteran parasites; Cotesia flavipes; Frass mediated host finding behaviour; Karnataka; Bangalore; Frass mediated host finding behaviour by hymenopteran parasite, influencing factors Cotesia flavipes (Braconidae); Lepidopteran hosts; Chilo partellus; Karnataka; Bangalore; Frass mediated host finding behaviour, influencing factors, lepidopteran host none