Abstract
Abstract A description is provided for Ustilago bullata . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Agropyron, Bromus, Brachypodium, Elymus, Festuca, Hordeum, Sitanion . DISEASE: Causes head smut of grasses particularly species of Bromus and Agropyron . Sori develop at the base of spikelets and usually involve the ovary but glumes are usually unaffected, phyllody of floral parts also occurs. Latent infection with very reduced sori production can also occur. Infected seedlings show stunting and poor survival, older plants show slow growth rate and leaf distortion has been observed (56, 265). GEOGRAPHICAL DISTRIBUTION: Europe, North and South America, W. Asia (USSR, Poland, Iraq), India, Kenya, Australia, New Zealand. TRANSMISSION: Teliospores are released from the inflorescence sori to contaminate soil and seed. Teliospores have remained viable (in artificial storage) for 12 years. Germination results in the production of a metabasidium and sporidia, plasmogamy then produces a dikaryotic infection hypha. Seedlings and older shoots become infected, the former producing completely infected plants, but the latter producing separately diseased tillers (see Falloon, 1979).
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