Behavioral responses of Chrysopa septempunctata to synomones of tea plants and sex pheromones of aphids: Effectiveness on tea aphid control Attraction effect of main volatile components from tea shoots and flowers on Sphaerophoria menthastri(Diptera:Syrphidae) and Chrysopa septempunctata(Neuroptera:Chrysopidae) Electroantennogram and behavioural responses of two varieties of Leis axyridis from three types of habitats to aphid-damaged tea shoot volatiles and aphid kairomones