Abstract: By using Y-tube olfactometer, this paper studied the behavioral responses of cotton aphid (Aphis gossypii) and its two natural enemies Coccinella undecimpanctata and Chrysopa phyllochroma to different odor sources. No significant difference was observed in the attraction of healthy cotton leaves and the leaves injured by insects or treated with methyl jasmonate (MeJA) to cotton aphids. The selection of C. undecimpanctata and C. phyllochroma to the injured leaves was 2.7 and 2.2fold of that to the healthy leaves, respectively, with significant differences (P<0.001) among them. The selection of C. undecimpanctata and C. phyllochroma to the leaves treated with MeJA was significantly higher than that to the healthy leaves (P<0.01). The leaves treated with 0.02 μmol·mL^-1 of MeJA showed the strongest attraction to natural enemies. Even the leaves treated with MeJA alone also had the attraction to C. undecimpanctata and C. phyllochroma. This study would provide a theoretical basis for the chemical ecological regulation of cotton aphid.

Key words: food security, resource use, rice planting, dense planting with less nitrogen application, greenhouse gas.