Impact of Fall and Spring Fungicide Applications on Dollar Spot
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Plant Pathology Honors Theses;2005
Dollar spot, caused by Sclerotinia homoeocarpa, is one of the most widespread and chronic diseases of golf course turfgrass worldwide (Vargas, 1994). Cultural practices designed to minimize periods of leaf wetness and ample nitrogen fertility can decrease disease severity, but repeat applications of fungicides throughout the growing season are required to effectively manage dollar spot on intensively cultivated turfgrass. The objective of this research was to assess the impact of fall and/or early spring fungicide applications made to asymptomatic turfgrass on the development of dollar spot disease severity the following growing season. Replicated field studies at two locations with both contact and systemic fungicides were conducted in the fall and spring. Both fall and spring preventative fungicide treatments significantly delayed the onset of disease and the enduring severity of symptoms. Weather conditions in the fall significantly influenced the effectiveness of the treatments.
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