Xanthomonas axonopodis pv. vignicola
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Xanthomonas axonopodis pv. vignicola (Burkholder 1944) Vauterin et al. 1995 - (bacterial blight of cowpea)
The bacterium is common in areas where cowpea is cultivated. Early symptoms include water-soaked leaf spots, which enlarge and become necrotic, surrounded by yellow haloes. Cracking and brown stripes develop on the stems and pods/seeds also become infected.
Outbreaks can result in the infection of all susceptible plants and in substantial yield losses. The pathogen survives in the soil, in plant debris and alternate hosts, but infected seeds are the most common way of spread of the disease.
Xanthomonas campestris pv. vignicola