none Odor-mediated host-searching by female Microplitis croceipes , a braconid endoparasitoid of larval Heliothis species, was studied in a flight tunnel. Volatiles emitted by third-instar H. zea feeding on cowpea seedling leaves were released and carried with the wind. Flight maneuvers of M. croceipes had a higher stereotype in jet plumes compared to irregularly shaped plumes. Variation in odor concentration in jet plumes due to intermittent feeding of the host larvae did not affect the number of flights.