Outlook Bleak for the Control of Bacterial Diseases of Ornamentals

The search for new products to aid in the control of bacterial plant pathogens on ornamental crops continues to look unpromising. IR-4 just released the results of efficacy tests of potential control products. Their summary follows: 

“During 2008 and 2009, 45 products were tested through the IR-4 Program as drench or foliar applications against bacterial pathogens (Table 1). Species tested included: Erwinia chrysanthemi, Pseudomonas chicorii, P. marginalis, P. syringae, Pseudomonas spp., Xanthomonas campestris and Xanthomonas spp. In general, all products, including the standard copper containing bactericides (Camelot, CuPRO, Cuprofix, Cuprofix MZ, Junction, Kocide, Phyton 27 and ReZist), provided no to poor control of these bacterial pathogens. Further research is needed to obtain additional efficacy data to recommend actions to register or amend labels for these pests.”  


 To see the results of these and other IR-4 trials, please go to: http://ir4.rutgers.edu/Ornamental/ornamentalSummaryReports.cfm.


About Don Ferrin

I am an associate professor and extension specialist in the Department of Plant Patholgy & Crop Physiology with the LSU AgCenter in Baton Rouge. I have statewide responsibility for issues and educational programs related to diseases of all horticultural crops in Louisiana.
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