Control Efficacy of Antifungal Protein AMP to Hybrid Bamboo Blight and It‘s Effect on the Activities of Defense-Related Enzymes in Hybrid Bamboo Identification of Streptomyces purpeofuscus YSSPG3 and purification of its antifungal protein Fermentation of Streptomyces purpeofuscus YSSPG3 and the control effect of its culture filtrate on hybrid bamboo blight