Abstract
Abstract A description is provided for Pseudomonas syringae pv. sesami . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Sesamum indicum . Inoculation of Phaseolus vulgaris stems and pods produces characteristic reddish spots with bacterial exudate, but leaves are not infected. Limited reactions reported for some other plants by Sutic & Dowson (1962) were probably what would now be called hypersensitive reactions. DISEASE: Dark brown to black leaf spots tending to be limited by veins. Spots may also appear on all other above-ground parts. On stems they often elongate and coalesce into lesions several cm long. Early infection of capsules may turn them black. Seriously infected plants may die. Under damp conditions epidemics cause severe losses. GEOGRAPHICAL DISTRIBUTION: Tanzania, China, India, Japan, Korea, Turkey, Bulgaria, Greece, Yugoslavia, USA, Brazil (see CMI Map 398, ed. 2, 1973). Recent reports not included on the map are Uganda (56, 116), South Africa (58, 1681), Mexico (55, 5647) and Venezuela (54, 524). The known distribution in India now includes the whole of UP (49, 2389a). TRANSMISSION: Within the crop transmission is presumed to be by wind-driven rain. Seed transmission occurs (58, 5764) and allows spread into new areas.
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