Management of Xanthomonas Leaf Blight of Onion with a Plant Activator, Biological Control Agents, and Copper Bactericides

Plant Disease
David H Gent, Howard F Schwartz

Abstract

Xanthomonas leaf blight (Xanthomonas axonopodis pv. allii) is a yield-limiting disease of onion (Allium cepa) in the western United States. Frequent applications of copper-based bactericides amended with an ethylenebisdithiocarbamate fungicide (e.g., maneb or mancozeb, class B2 carcinogens) provide some disease suppression, but strategies to reduce conventional bactericide use are needed to minimize grower costs, environmental impact, and public exposure to class B2 pesticides. Applications of acibenzolar-S-methyl reduced in planta and epiphytic populations of X. axonopodis pv. allii as effectively as applications of copper hydroxide-mancozeb in growth chamber studies. Under field conditions, four weekly applications of acibenzolar-S-methyl reduced severity of Xanthomonas leaf blight as or more effectively than 9 to 12 weekly applications of copper hydroxide or copper hydroxide-mancozeb. Acibenzolar-S-methyl applications did not increase bulb yield or grade compared with copper bactericide treatments. However, bulb yield was reduced 22 to 27% when 10 weekly applications of acibenzolar-S-methyl were made in the absence of disease. Application of a commercial formulation of both Pantoea agglomerans strain C9-1 and Pseudomonas flu...Continue Reading

References

Jun 1, 1995·Environmental Health Perspectives·P HouetoJ R Hoffman
Dec 9, 1998·Proceedings of the National Academy of Sciences of the United States of America·B P ThommaW F Broekaert
Aug 16, 2002·Current Opinion in Plant Biology·Barbara N Kunkel, David M Brooks
May 7, 2003·Current Opinion in Biotechnology·Kim E Hammond-Kosack, Jane E Parker
Oct 24, 2008·Phytopathology·David H GentChristopher B Lawrence
Aug 1, 2004·Plant Disease·M T MomolJ J Marois

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Citations

Mar 28, 2007·Annual Review of Phytopathology·J B JonesM T Momol
Dec 1, 2006·Plant Disease·David H GentHoward F Schwartz
Mar 28, 2013·Bacteriophage·Jeffrey B JonesM Timur Momol
Jul 1, 2007·Plant Disease·Jillian M LangHoward F Schwartz
Mar 1, 2011·Plant Disease·Dennis A JohnsonBrenda K Schroeder

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