Abstract
Abstract A description is provided for Mycosphaerella zeae-maydis . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Zea mays (main host), Sorghum vulgare [Sorghum bicolor] var. sudanensis (= Sorghum bicolor ) and Setaria . DISEASE: Yellow leaf blight of maize. Leaves at all stages of maturity are susceptible to infection. Heavy infection of seedlings causes stunting whilst severe infection of leaves causes death of entire leaves. GEOGRAPHICAL DISTRIBUTION: North America (Canada, Ontario; U.S.A., New York, Wisconsin) South America (Bolivia, Equator). TRANSMISSION: Presumably by seed which may be contaminated by infected plant debris in the soil. So far the actual mode of infection in the field has not been investigated. Since the fungus overwinters as immature pseudothecia on leaves it has been suggested that ascospores may be responsible for early infection in the spring whilst conidia are responsible for secondary infection in the growing season (Mukunya & Boothroyd, 1973).
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