Abstract
A new type of disease of mulberry, necrotic spot with halo on leaves and generalchlorosis of young shoots, was found in Shimane Prefecture in 1971. The bacteriumisolated from infected leaves was similar to Pseudomonas mori in its bacteriologicaland serological properties and in its host range, hence was identified as a new strainof Ps. mori causing halo blight by means of its halo-inducing toxin.
