Abstract
Abstract A description is provided for Cochliobolus carbonum . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Zea mays . DISEASE: Leaf spot of Zea mays . Leaf symptoms differ according to the physiologic race. Race 1 gives oval to circular, straw-coloured, dry and papery lesions which become zonate with light to purplish-brown margins; they are abundant, up to 1.5 × 2.5 cm and often coalescent. Race 2 gives oval, chocolate-brown spots, sometimes irregular, up to 0.5 × 2.5 cm and less abundant than those of race 1. Both races cause ear rot, a black, felt-like growth over the kernels giving a charred appearance (23: 293). GEOGRAPHICAL DISTRIBUTION: Central and southern Africa, S.E. Europe, India (E.), Cambodia, China, Australia (NSW, Qd); New Caledonia, Canada (Ontario), USA (E.), Argentina and Colombia (CMI Map 380, ed. 2, 1969). Additional records not mapped are: Costa Rica, Guatemala, Salvador. TRANSMISSION: Seed infection is often deep seated (47, 3058); also air-dispersed through the conidia.
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