First report of orange rust of sugarcane caused by Puccinia kuehnii in Mexico, El Salvador, and Panama.
Symptoms of sugarcane orange rust were observed on 17 July 2008 on sugarcane cultivars Mex 57-1285, Mex 61-230 and Co 301 in Chiapas, Mexico. In El Salvador, from August 2008 to January 2009, rust symptoms were observed on cv. CP 72-2086 in 1117 dispersed sugarcane production fields in various localities. Rust symptoms were first observed on sugarcane cv. SP 74-8355 (more than 25% severity) at Natá, Coclé province in Panama from January to February 2008. The pathogen was identified as P. kuehnii based on the morphology and molecular characteristics of the isolate. This is thought to be the first report of P. kuehnii causing orange rust disease of sugarcane in El Salvador, Mexico and Panama.