Mycovellosiella phaseoli. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Mycovellosiella phaseoli. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOST: Phaseolus vulgaris, the french bean. DISEASE: Floury spot of bean or Mancha harinosa. The name derives from the white tufty growth of the fungus on the lower leaf surfaces. Yellowish spots develop on the leaves and in severe infections these appear as a yellow mottling. In old infections the spots become brown with a yellow margin. Infection is confined to the leaves and progresses upwards from the base where it can cause severe defoliation (37, 749). GEOGRAPHICAL DISTRIBUTION: Africa, Asia, Europe, South America (CMI Map No. 436, ed. 2, 1977). TRANSMISSION: By wind dispersal of air-borne conidia.