Abstract: In this study, different concentrations of methyl salicylate (MeSA) were sprayed on the tea plants in a nuisance-free tea garden, and yellow sticky trap was used to investigate the population densities of pests and their natural enemies. No significant effect was observed after 24 h MeSA treatment. However, after 48 h, there was a significant decline in the number of tea green leafhopper and a significant increase in the number of ladybug, spider, syrphid, and parasitoids, as compared with the control, which indicated that exogenous MeSA could induce the natural defense of tea plants to the pests, and further, affect the population densities of pest species and their natural enemies in tea garden.

Key words: Continuous cropping stress, Soybean, Chloroplast, Se, Microelement