CONTROLLING AGENT FOR SOFT ROT AND CONTROL OF SOFT ROT

摘要

NEW MATERIAL:Erwinia carotovora subsp. carotovora CGE 234 M 403 strain (FERM P-11792) having no soft rot pathogenicity by deleting with a mutagenic treatment. USE:A controlling agent for plant soft rot. Free from chemical injury and with safety. PREPARATION:Erwinia carotovora CGE 234 strain is put to a mutagenic treatment using e.g. ultraviolet rays, a mutagenic reagent such as nitrosoguanidine, and pathogenicity-deleted strains are screened by determining the presence or absence of the decline in pectinase secretion activity. Furthermore, strains with high lesion-inhibitory ability are selected from said pathogenicity-deleted strains.