Study on the Chemical Control of Monochamus alternatus Effects of DCPTA on the Physiological and Biochemical Characteristics in Maize Seedling Leaves Under Low Temperature Stress Studies on the Dynamics and Distribution Pattern of Landscape Elements in the Forest Landscape Restoration Process in Guandi- shan Forest Region Controlling effect of parasitoids on population of vegetable leaf miner Liriomyza sativae Blanchard Response of the alligator weed flea beetle, Agasicles hygrophila (Coleoptera:Chrysomelidae) to overwintering protection and its controlling effect on alligator weed Alternanthera philoxeroides (Amaranthacese:Alternanthera)