Inoculum Sources and Survival of Xanthomonas axonopodis pv. allii in Colorado

Plant Disease
David H GentHoward F Schwartz

Abstract

Xanthomonas leaf blight, caused by the bacterium Xanthomonas axonopodis pv. allii, is an emerging disease of onion in the western United States and worldwide, but few management strategies have been developed because little is known about disease epidemiology and pathogen survival. Therefore, we sought to identify and quantify primary inoculum sources of the pathogen in Colorado. Growth chamber and field studies evaluated survival and dissemination of X. axonopodis pv. allii in association with weed, alternate host, and volunteer onion plants, irrigation water, and crop debris. Epiphytic X. axonopodis pv. allii was recovered from the foliage of nine asymptomatic weed species and Medicago sativa, but the bacterium was not recovered from plants in locations where an epidemic of Xanthomonas leaf blight did not occur the prior year. The bacterium also was isolated from volunteer onion with characteristic Xanthomonas leaf blight symptoms. A rifampicin mutant of X. axonopodis pv. allii strain O177 was recovered consistently from the irrigation tail water of onion fields inoculated with the bacterium; populations as large as 3.02 × 104 CFU/ml were recovered. X. axonopodis pv. allii was recovered from infested onion leaves 9 months aft...Continue Reading

Citations

Apr 12, 2013·Journal of Food Protection·Michael MahovicSteven Rideout
Aug 2, 2014·Genome Announcements·L GagnevinR Koebnik
Jul 1, 2007·Plant Disease·Jillian M LangHoward F Schwartz
Jun 1, 2013·Plant Disease·Patrícia da S MachadoCamila da S Freitas

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