Submitted to: American Society of Sugar Cane Technologists
Publication Type: Abstract Only
Publication Acceptance Date: 5/20/2006
Publication Date: 6/20/2006
Citation: Grisham, M.P. 2006. Effect of Ratoon Stunting Disease on Yield of Sugarcane Cultivars Recently Released in Louisiana [abstract]. Journal of American Society of Sugar Cane Technologists. 26:49. Available: http://www.assct.org/journal/journal.htm
Technical Abstract: The yield response of six recently released Louisiana cultivars to infection by Leifsonia xyli subsp. xyli, the causal bacterium of ratoon stunting disease, varied in field trials conducted between 2001 and 2005. Sugar yields were compared to LCP 85-384, the leading Louisiana cultivar released in 1993, in two crop cycles that included plant- cane, first-ratoon, and second-ratoon crops. No yield loss was observed in HoCP 96-540 released in 2003 or in cultivars Ho 95-988 and L 97-128 released in 2004. These cultivars also had the lowest percent colonized vascular bundles (CVB) among the cultivars tested (2, 9, and 14%, respectively). Moderate yield loss of sugar was observed in HoCP 91-555 (5%) released in 1999 and in L 99-226 (6%) released in 2006. Although loss of sugar in HoCP 91-555 and in L 99-226 was similar to that of LCP 85-384 (5%), percent CVB was much higher in HoCP 91-555 (49%) and in L 99-226 (69%) than in LCP 85-384 (23%). Cultivar L 99-233, also released in 2006, is considered to be highly susceptible to L. xyli subsp. xyli infection because of the high yield loss observed (22%) and high percent CVB (86%). All cultivars tested were infected with L. xyli subsp. xyli and practices to control infection through the use of pathogen-free seed cane and cleaning equipment to prevent mechanical spread should continue in all cultivars. Although moderate yield loss was observed among some cultivars, those with high percent CVB have the potential for rapid spread and control in these cultivars may be more difficult.