Abstract
Abstract A description is provided for Xanthomonas phaseoli var. fuscans . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Phaseolus vulgaris, P. lunatus and P. coccineus ; also on other leguminous hosts on inoculation (39: 3). DISEASE: Fuscous blight. On seeds, pods, leaves and stem. The symptoms of fuscous blight are very similar to common blight, X. phaseoli , with small water-soaked lesions on the leaves which develop into spots with dry, brown centres but X. phaseoli var. fuscans is stated to be more virulent on inoculation to bean and to produce a slight hypertrophy of the tissues about stem wounds. GEOGRAPHICAL DISTRIBUTION: Africa (Ethiopia, Sudan, Uganda): Australasia (New South Wales): Europe (Hungary, Switzerland, U.S.S.R., Yugoslavia); North America (Canada, U.S.A.); (CMI Map 402, 1965). TRANSMISSION: Seed-borne and by wind driven rain splash or wind blown soil in the field (31: 128). The pathogen can survive for long periods both in seed and on dead plant material.
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