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Bayer Environmental Science says 16 states have recently approved the use of Bayleton 50 WP fungicide as a preventative treatment for fairy ring in turfgrass.
The product may be applied as a foliar spray at the rate of 1 to 2 ounces per 1,000 square feet. Applicators may make two applications of Bayleton in the spring, prior to the appearance of disease symptoms, with a 14-day interval. They should extend the interval to 21 days if using the 2-ounce rate of Bayleton on Poa annua putting greens.
States that have approved Bayleton for fairy ring prevention are: Arkansas, Colorado, Iowa, Illinois, Indiana, Kansas, Michigan, Minnesota, Missouri, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia and Wisconsin.
The approval allows for tank mixing with an appropriate soil wetting agent to assist with disease control by allowing optimum penetration of the fungicide and also reducing hydrophobic soil conditions.
Francisco Uviña, University of New Mexico
Hardscape Oasis in Litchfield Park
Ash Nochian, Ph.D. Landscape Architect
November 12th, 2025
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