First Report of Puccinia kuehnii, Causal Agent of Orange Rust of Sugarcane, in the United States and Western Hemisphere

Plant Disease
Jack C ComstockL A Castlebury

Abstract

In June 2007, approximately 8 km east of Belle Glade, FL, a rust disease was observed on a sugarcane (a complex hybrid of Saccharum L. species) cultivar (CP 80-1743) considered resistant to brown rust caused by Puccinia melanocephala Syd. & P. Syd. Approximately 10 km south of Canal Point, FL, another cultivar (CP 72-2086), also considered resistant to P. melanocephala, was found to be infected with a rust. Samples were sent to the USDA-APHIS National Mycologist and the USDA-ARS Systematic Mycology and Microbiology Laboratory in Beltsville, MD for identification. Observed morphological features were consistent with P. kuehnii E.J. Butler. Uredinial lesions were orange and variable in size, measuring 650 to 850 × 26 to 32 μm, hypophyllous, ellipsoidal to fusiform in shape, and distinctly lighter than pustules of P. melanocephala that were present in the area along with P. kuehnii. Urediniospores were mostly obovoid to pyriform or broadly ellipsoidal, variable in size, 32 to 45 × 25 to 30 μm, and moderately echinulate with mostly evenly distributed spines 2 to 4.5 μm apart. Walls were orange-to-light cinnamon brown, 1 to 2.5 μm thick with a pronounced apical wall thickening as much as 7 μm, and 4 to 5 equatorial pores. Similar or...Continue Reading

Citations

Oct 22, 2019·Phytopathology·Bhim ChaulagainPhilippe Rott
Aug 20, 2017·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Heng-Bo WangYun-Hai Lu
Dec 1, 2009·Plant Disease·Sushma G SoodNeil C Glynn

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