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Managing Difficult Plant Diseases By James Chatfield, Joe Boggs, and Erik Draper T urf professionals often speak about why plant diseases are so difficult to manage. They generally note some key challenges, including how the inoculum of plant pathogens is microscopic and how they do not see the pathogen arrive on a plant, germinate, penetrate, and infect it. By the time visible symptoms develop, it is too late to prevent the invisible (to the naked eye) infection that has already occurred days, weeks, or months earlier. 30 November 2013 CG_Nov2013.indd 30 10/28/13 11:13 AM