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2007 ARS National Sugarcane Workshop
Sugarcane Orange Rust
In June 2007, symptoms of sugarcane orange rust were observed in grower fields. Subsequently, the disease was confirmed by both morphological and molecular techniques. This was the first confirmed documented observation of Puccinia kuehnii, the causal agent of sugarcane orange rust in Florida and the Western Hemisphere. Subsequently, orange rust has been confirmed and reported as occurring in Guatemala, Costa Rica and Nicaragua. This pathogen was previously reported only in Southeast Asia, Australia and the Philippines. The introduction of sugarcane orange rust is highly significant since the major commercial cultivar, CP 80-1743, is susceptible and has had serious yield losses due to the disease.
Changes in the CP-Cultivar Development Program
In response to the introduction of the sugarcane orange rust pathogen, P. kuehnii, there has been a shift in research emphasis to address the orange rust problem. All clones in the cultivar development program from Stage I through the end of the development program are being assessed for their reaction. Ratings are taken based on natural infection in experimental plots. Also, an artificial inoculation method has been developed and is used to screen clones in Stage II through Stage IV of the program.
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Last Modified: 04/28/2009
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