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Response of virgin N. vitripennis females in the olfactometer bioassay to pheromone deposits released by males from LA+ and LA− hosts, respectively. (a) First choice for and (b) mean residence time (±s.e.m.) in the marked cavities within an observation time of 5 min. Asterisks indicate significant differences at p < 0.01 (**) and p < 0.05 (*) (first choice: two-tailed binominal test, residence time: Wilcoxon matched-pairs test).
