SUGARCANE RUSTS IN FLORIDA By

SUGARCANE orange rust symptoms were first observed in Florida in June 2007 on cultivar CP 80-1743. The causal agent, Puccinia kuehnii, was subsequently verified morphologically and molecularly constituting the first confirmed report of sugarcane orange rust in the Western Hemisphere. Orange rust was distributed throughout the entire Florida sugarcane industry, primarily on cultivars CP 80-1743 and CP 72-2086. The objective of this research was to evaluate the reaction of the commercial cultivars to both sugarcane brown and orange rusts and to assess their effect on the CP-cultivar development program in Florida. The rust reactions of several widely grown commercial cultivars, newly released cultivars and clones in the selection program, parental clones and CP historical clones were determined in order to develop a suitable resistance strategy to address the new incursion of orange rust. Changes in the program to increase the level of rust-resistant progeny are detailed.

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