First report of orange rust of sugarcane caused by Puccinia kuehnii in Ecuador.
Orange rust pustules were observed on August 5, 2011, in commercial sugarcane fields located in the Ecuadorian Pacific coast of South America. Pustules were observed on cultivar SP79-2233 and sugarcane clones of the CINCAE breeding program (EC06-351, EC06-340, and EC01-744). Low levels of disease incidence and severity were observed in the sugarcane germplasm. The causal pathogen was identified as Puccinia kuehnii based on morphological and genetic (PCR) analyses. This is thought to be the first report of the presence, distribution and disease spread by P. kuehnii on sugarcane in Ecuador.