Figure 2From: Behavioural response of the malaria vector Anopheles gambiae to host plant volatiles and synthetic blendsOlfactometer responses of An. gambiae to odour of intact plants. A) intact plant odours versus blank control; B) plant odours from different species expressed as Preference Index (PI) ± SEM. Positive response indicates preference for the first odour source. The asterisks indicate the significance levels with * = significant at 0.05, and ** = significant at 0.01.Back to article page