Abstract
Abstract A description is provided for Puccinia cacabata . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Aecial stage on species of Gossypium . Uredial and telial stages on species of Bouteloua and Chloris . DISEASE: Cotton rust. The pycnial lesions on the upper surface of cotton leaves are sometimes surrounded by a maroon zone. The aecia are commonest on the leaves but many occur on stems and severe infection causes defoliation. Carpel infection leads to dwarfing of the locules and attacks on the peduncle contribute to breakage and loss of bolls. Infection of cotton seedlings may cause death. GEOGRAPHICAL DISTRIBUTION: The aecial state appears to have been reported from USA (Ariz., N. Mex., Okla, Texas, 22: 385; 39: 470; 40: 511) and Mexico only (37: 721; 38: 520). The telial stages seem more widespread and, in addition, occur in Argentina, Bahamas, Bolivia, Brazil and Dominican Republic (36: 32). TRANSMISSION: Sporidia from overwintering teliospores on the wild grass hosts spread to cotton in the late spring and summer.
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