Abstract
Oxidase‐negative. fluorescent pseudomonads were isolated from cankers, necrotic buds, spots and lesions on leaves and fruit, blasted blossoms and blossoms with lesions on the inside of the calyx cup. as well as from symptomless buds, leaves, blossoms and fruit of pear trees (Pyrus communis). The isolates (431) were characterized by biochemical tests as Pseudomonas syringae pv. syringae and as forms intermediate between this pathovar and P.s. pv. morsprunorum. A resident phase of pv. syringae was found on leaves, fruits and blossoms, and in buds. Typical symptoms appeared on healthy pear trees inoculated with 18 lest isolates of P.s. pv. syringae and two intermediate isolates. A heterogeneous group of strains of P. syringae seems to cause pear blossom blast in South Africa.
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