Abstract
Abstract A description is provided for Chaetoseptoriawellmanii . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Phaseolus vulgaris and Vigna unguiculata (=Vigna sinensis ). DISEASE: Brown leaf spot of Phaseolus and Vigna . At first lesions appear as small purplish brown or chocolate spots with distinct margins. With the progress of infection spots enlarge, occasionally coalesce, turn reddish-brown and become rounded or irregular reaching up to 1 cm wide with lighter or whitish centres. Older lesions become distinct on both surfaces with distinct margins prominent on the upper surfaces with pycnidia scattered within the spots. GEOGRAPHICAL DISTRIBUTION: Central America (Guatemala, El Salvador) South America (? Colombia). TRANSMISSION: Little information exists on natural infection and how the disease spreads in the field. It is possible that conidia could be dispersed by water splash and the fungus might survive in crop debris left from previous years.
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