| The damage caused by tea pests was one of the most important factors affacting the tea quality and quantity in tea production. The unreasonably relied on chemical pesticides for tea pest controlling in tea plantations would cause a harmful reverse action not only for the beneficial natural enemies and their sustainable controlling role, but also for the residue in tea product and the polution for environment. As the demands of harmless (or organic) tea comsumption rapidly increased, reasonably interplanting as many green manures as possible so that to increase the biodiversity in tea plantations and promote the sustainable ecological control of tea pests, became one of the important tasks for the ecological (organic) tea plantations.According to the need of the construction of modern ecological (organic) tea plantations, the population dynamics of the most serious pest, small green leafhopper (SGL), Empoasca vitis (G?the), was investigated. The behavioral response of SGL to the volatiles from 14 species of green manures were detected and the volatiles of Fuyun no.6 and 4 species of green manures were assayed in laboratory, so that to provide a scientific basis for further control of SGL and construction of organic tea plantations. The results were as follows:The population dynamics of SGL on 5 tea varieties (Tieguanyin, Huangdan, Fuding Dabaicha, Fuyun no.6 and Rougui) were conducted by plant-flapping in the tea plantation of Fujian Agriculture and Forestry University (FAFU) from November, 2009 to November, 2010, a significant positive correlation among the population dynamics of nymphae and adults of SGL was shown, which indicated that the population dynamics of SGL were generally similar to each other on the 5 tea varieties. The population dynamics of SGL had two population peaks annually and the first peak was higher than the second one.The behavioral responses of SGL to volatiles from the shoots and leaves of 14 species of green manures were detected by using a Y-tube olfactometer in laboratory. The preliminary results compared with air condiction showed that volatiles of Crotalaria pallida Ait., Indigofera spicata Forssk, Trifolium hybridum Linn., Gassiu surattensis Burm·f, Lotononis bainesii Baker, Cassia corgmbosa Lam., Chamaecrista rotundifolia (Pers.) Greene possessed obvious attractive activity for SGL. And volatiles of Amorpha fruticosa Linn., Cassia alata Linn., Coronilla varia Linn., Cajanus cajan Linn., Medicago sativa Linn., Trifolium repens Linn. didn't show attraction to SGL. While volatiles of Magnolia multiflora Wang et Min had a repellent effect on SGL. Further comparision between green manures and tea shoots of Fuyun no.6 indicated that the behavioral responses of SGL to volatiles from Indigofera spicata,Trifolium hybridum, Crotalaria pallid were significantly weaker than that from tea shoots,and the behavioral response of SGL to volatile from Lotononis bainesii was significantly weaker than that from tea shoots. While as the behavioral response of SGL to volatile of Chamaecrista rotundifolia was significantly stronger than that from tea shoots.The main volatiles of Fuyun no.6 and 4 species of green manures,which known from the behaivior response test above, were extracted by Solid Phase Microextraction(SPME) and identified by GC-MS method. 26 components were identified from the volatiles of Fuyun no.6. And 17,26,40 and 30 components were identified from the volatiles of Chamaecrista rotundifolia (Pers.) Greene,Lotononis bainesii Baker,Crotalaria pallida Ait. and Indigofera spicata Forssk respectively. The volatile components include terpenes and derivative,alkane,alcohol,acids,ketone,esters,aldehydes and other substances, among which terpenes and derivative,alcohol and esters were more than the others. |
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