Abstract
Abstract A description is provided for Rosellinia pepo . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: According to Waterston (1941) R. pepo has a more restricted range than R. bunodes . Susceptible species include avocado, banana, breadfruit, cacao, coffee, dasheen ( Colocasia antiquorum ), jak ( Artocalpus integer ), horse bean ( Canavalia sp.), immortelle ( Erythrina ), lime, nutmeg, pigeon pea, West Indian locust ( Hymenaea coulbalii ). DISEASE: Black root rot, mainly of tropical and subtropical woody hosts; plurivorous but recorded less often than R. bunodes (CMI Descript. 351), with which it has often been associated in the American tropics. At the collar the mycelial fan has a light grey margin, shading to brown or purplish-black. On roots the greyish cobweb-like strands become black and coalesce into a woolly or felt-like mass. Beneath the bark white fans (star-like) of mycelium occur on the surface of the wood. Thin plates of mycelium in the wood appear as zig-zag lines in section. In culture deep brown, later olive green, strands, white becoming black. GEOGRAPHICAL DISTRIBUTION: Apparently at present restricted to central America, the West Indies and West Africa; other records are of doubtful authenticity. TRANSMISSION: As mycelium from surface organic litter and woody debris.
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