The Gray Sequence between the Mites on the Leaves of Phyllostachys heterocycia and Its Bust

selecting the amount of Oligongchus. urama in 2-aged bamboo, in over 3-aged bamboo, the amount of brown spot in over 3-aged bamboo, Schizotetranychus nanjingensis nest in bamboos more than 3 years old, Aponychus corpuzae egg crust in over 3-aged bamboos as effect factors on bamboo's bust, the paper analysed the relations between the factors and the bamboo's bust by gray theory.The results indicated that their sequence of damaging the bamboo was Schizotetranychus nanjingensis, Aponychus corpuzae, disease spots, and Oligongchus. urama.