Each year at the Ohio Turfgrass Foundation Turfgrass Research Field Day, the plant pathology team of Joe Rimelspach, Ph.D., Todd Hicks and Francesca Peduto Hand make available the latest version of the handy guide entitled "Families of Fungicides for Turfgrass".
The guide includes information such as the name of the active ingredient, FRAC code, trade names, mode of action and concerns about resistance on dozens of fungicide products, including chlorothalonil, iprodione, mancozeb, new products like mandestrobin, and more than 30 others.There are some updates to this year to the guide that also is available as a printable, downloadable PDF.
The single greatest concern surrounding fungicide use, besides efficacy, is the threat of resistance. The latest version of the OSU guide includes information on combination fungicide products as well as FRAC codes for each to help superintendents make more informed decisions.
"This way, people can quickly know what families are in those combination products," said Rimelspach. "The guide can help them understand things a little better and make better choices. They can manage rotation to help manage resistance, so they're not using the same family of product over and over again.
Rotation to help manage resistance, not using same product over over again and make better choices and understand things."
Some of the dozens of combination products included on the guide are chlorothalonil plus acibenzolar-S-methyl and pyraclostrobin plus pyraclostrobin as well as chlorothalonil plus iprodione plus T-methyl plus tebuconazole, which includes active ingredients from four different fungicide families.