Page 9 - GreenMaster Fall 2022

and timing plus snow mould control
Snow moulds are one of the most
important turfgrass diseases facing Canadian golf course superinten- dents, and the decisions made in controlling snow mould can have far-reaching consequences for the success of the facility (Figure 1). Complicating these decisions are the increasing unpredictability surround- ing the changing climate, new products coming to the market, and old standbys being removed from the market. In this article, we will review some of our recent research on snow mould fungicide persis- tence, optimal timing for snow mould fungicides, and the use of iron sulfate for snow mould suppression.
SNOW MOULD FUNGICIDE PERSISTENCE
Sometimes, I think that our expecta- tions for snow mould fungicides are a little unrealistic compared to summer fungicides. We’re happy if we get 14 to 21 days of control out of a dollar spot application in July, but we’re frustrated if we don’t get 6 months of snow mould control from an applica- tion during the winter!
Figure 1. This time series from our research facility in Madison, WI, shows the snow mould damage that can still be present 6 weeks after snow melt. In fact, this site didn’t fully recover until early July! Figure created by Kurt Hockemeyer.
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