Clint Mattox – Oregon State University
Microdochium patch is a turfgrass disease in cool, humid regions caused by the pathogen Microdochium nivale. Increasing pesticide restrictions have generated concern regarding management of Microdochium patch. A summary of four years of fungicide alternative research will be presented focusing on cultural practices, fertility regimes and fungicide alternative products. Cultural practice results will focus on a dew removal trial followed by the benefits of rolling regarding Microdochium patch suppression. Fertility research results will include new information regarding the use of low rates of urea throughout the winter to encourage turfgrass recuperation without causing a detriment to Microdochium patch severity as well as studies focusing on the use of iron sulfate to suppress Microdochium patch. In addition, results focusing on the use of potassium phosphites and sulfur will be presented. In conclusion, multiple field trials focusing on using mineral oils to control Microdochium patch will be presented.
