Effect of Trunk Injection of Pesticides on Physiological Properties and Protective Enzymes in Leaves of Pinus massoniana

Injection of Cyhalodiamide and Emamectin benzoate in Pinus massoniana trunk on March 25th of 2015 in Jiangxi province for determination of physiological properties and protective enzymes in leaves of tested trees. The result showed that content of chlorophyll and total soluble sugar of injected trees decreased, but that of MDA increased. Trees injected by Cyhalodiamide had decrease of chlorophyll content by 10.3% in the 4th day, of total soluble sugar content by 15% in the 8th day, while of MDA content increase by 42% in the 4th day. The activity of SOD in trees injected the two pesticides had a curve of up-down-up-down. Cyhalodiamide had significant effect on SOD and PAL activities, the activity of SOD increased 39.5% in the 4th day, and that of PAL 40.7% in the 8th day after trunk injection.