Abstract
Abstract A description is provided for Physoderma maydis . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Maize ( Zea mays ) and teosinte ( Euchlaena mexicana ). DISEASE: Brown spot of maize, causing reddish-brown spots, streaks and pustules on blade, sheath and culm. The disease first appears as large round to oval spots along adjacent veins, eventually spreading on to the leaf sheaths. Confluence of the discrete sites results in the appearance of large brown streaks and pustules, which can be broken open to reveal numerous yellowish-brown resting sporangia. GEOGRAPHICAL DISTRIBUTION: Africa, Asia, Australasia, the Americas and West Indies (CMI Map 106, ed. 3, 1974). TRANSMISSION: Tisdale (1919) has shown that resting sporangia are easily dispersed by wind when dried infected leaves are broken. Local dispersal by spores swimming in water films may also occur.
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