Essential disease factors and control index of rice sheath blight in the southern Shaanxi Antifungal metabolites from a marine bacterium PY-sw-1 and effects on pathogenic fungi Advances in the studies on physiological mechanism of safener Effects of inhibitor and safener on enzyme activity and phenanthrene metabolism in root of tall fescue Inhibiting action and biocontrol effect on vegetable diseases of the activeproduct from Streptomyces lavendulae xjy strain Symptoms of root rot on Ligusticum chuanxiong and identification of its pathogen