![]() Disease development and spread is favoured by rainfall and the bacterium survives in crop residues.Īgar test using NBY media, selective media and biochemical analysis: The pathogen is seed borne and seed transmitted. ![]() Isolate 1 which produces yellow colonies on NBYis not sensitive to antibiotic lincomycin while isolate 2 which produces dark yellow/light brown colonies on NBY media is sensitive to lincomycin. Two biotypes have been isolated and identified morphologically from infected cowpea fields in Nigeria. The bacterium is gram- negative rod, single or in pairs motile by one polar flagellum.Colonies on NBY are yellow and circular. The major hosts of the bacterial blight pathogen are Vigna unguiculata (cowpea), Crotalaria juncea (sunn hemp), Lablab purpureus (hyacinth bean), Phaseolus vulgaris (common bean), Solanum nigrum (black nightshade), Tephrosia purpurea (purple tephrosia), Vigna mungo (black gram).Ĭhina, India, Turkey, Botswana, Egypt, Nigeria, S Africa, Sudan, Tanzania, Zimbabwe, Puerto Rico, USA. The bacteria infects also the stems, causing cracking, canker and the pods causing water soaked spots. Spots coalesce to form orange lesions surrounded by yellow halo. Leaves: pin point water soaked spots on the leaves. vignicola (Burkholder 1944) Dye 1978Īlthough yield losses from the fields have been reported, they have not been quantified vignicola (Burkholder 1944) Vauterin et al. Kumar).Ĭowpea bacterial blight, Bacterial blight, Leaf spotīacterial halo blight, Halo blight (of beans) Contributors to this section: IITA, Nigeria (M.
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