Relationship between contents of lignin and soluble sugar in plants of kiwifruit cultivars and their resistance to kiwifruit bacterial canker infected by Pseudomonas syringae pv. actinidiae Ecological factors affecting prevalence of kiwifruit bacterial canker and bacteriostatic action of bacteriocides on Pseudomonas syringae pvactinidae Prevalent forecast of kiwifruit bacterial canker caused by Pseudomonas syringae pv actinidiae