Abstract:To determine the potential attraction of tea shoot volatiles to Stethynium empoascae, a key egg parasitoid of the tea green leafhopper, laboratory behavioral bioassays using a Y-tube olfactometer and field trapping experiments in tea plantations were carried out. Results were as follows:1) volatiles released from the tender tea stems, buds, or leaves damaged by the feeding and oviposition activities of tea green leafhoppers, and their nearby un-damaged leaves, strongly attracted the mymarid S. empoascae; 2) twenty-seven volatile compounds were identified from healthy and leafhopper-damaged tea shoots as main components. Their synthetic candidates were dissolved in hexane at three dosages (10-6, 10-4 g/mL, and 10-2 g/mL) and further tested in the Y-tube olfactometer as odor resources on S. empoascae. It was found that cis-jasmone, linalool, nerol, pentanol, hexanol, 1-penten-3-ol, α-terpinene, α-terpineol, and (+)-3-carene significantly attracted the parasitoid at one or two dosages tested. Field trapping results indicated that:1) a ternary blend (at 1:1:1 ratio) of cis-jasmone, linalool, and 1-penten-3-ol each at 10-4 g/mL attracted more mymarids than any individual components in the tea gardens; furthermore, a mixture of six compounds (at equivalent ratios) including nerol, pentanol, and α-terpinene (each at 10-2 g/mL) along with hexanol, α-terpineol, and (+)-3-carene (each at 10-6 g/mL) attracted even more mymarids; 2) the half-life of the six-component blend was extended for 0.7 more days when liquid paraffin was added as a controlled release agent; 3) the mymarids were active mainly during 6:00-10:00 a. m., accounting for > 50% of the daily mymarid trap catches. In conclusion, volatiles from the tea leaves on the leafhopper-damaged shoots efficaciously attract mymarid parasitoids. Furthermore, synthetic tea shoot volatile blends at near natural release ratios, and their combinations with the jasmine yellow color might be more attractive to the egg parasitoid.