Responses of female Cotesia rubecula (Marshall) (Hymenoptera: Braconidae) to larval Pieris rapae (L.) (Lepidoptera: Pieridae) feeding on cabbage leaves were investigated in a flight tunnel. Latency of flight was shorter and the proportion of female wasps flying to leaves was greater when cabbage was infested with hosts. This indicated that wasps detected hosts prior to taking flight and were attracted to them. Wind speed was varied (18, 54, 100 cm/s) to examine its effect on the response of wasps to hosts. Flight was inhibited by increasing wind speed and was accompanied by less frequent but longer bouts of 'pointing' (antennae raised and spread, facing into the wind). The accuracy of landing but not the duration of flight to the plant was affected by increasing wind speed. The results indicated that increasing wind speed will reduce the rate of parasitoid oviposition. none