Fig. 3.

Choice response of Culex pipiens in a dual-port flight olfactometer to a six-component (full) synthetic blend of milkweed, Asclepias syriaca, floret volatiles compared to blends in which each component has been removed individually (reducted). Total response indicates the percentage of C. pipiens released that were captured by one of the blends (no significant differences by 1-way ANOVA). Relative response shows the proportional response to the reducted (gray bars) and full (black bars) blends. Numbers in bars indicate the mean number of C. pipiens responding (N = 4–6). Asterisks denote significant differences in mean response to reducted versus full blend by chi-squared test (* P < 0.05, ** P < 0.005)