Microdochium patch (Microdochium nivale) (sometimes referred to as Fusarium patch) is problematic from autumn through early-summer in many areas. Cool and warm season are all sensitive to this disease, especially under wet conditions.
Photo: Frank Wong, Bayer CropScience.
Photo: Rob Golembiewski, Bayer CropScience.
- Cultural management – cannot usually be used in isolation but should maximize control from fungicides:
- Reduce shade and maximize air movement
- Maximize drainage where possible through frequent topdressing and aerification, and improving surface and subsurface drainage where practical
- Reducing soil pH
- Maintain moderate but not excess nitrogen on actively growing grasses
- Iron sulphate applied at 12–24kg per hectare every other week according to recent research in the USA
- Regular lightweight rolling according to recent research in the USA
- Management with fungicides
- Under high pressure maintain a consistent program of preventative fungicide applications throughout the autumn, winter, and spring. Like with most foliar diseases, limiting inoculum even in the absence of symptoms is critical to maximize long-term control.
- Rotate fungicides with different modes of action to reduce the chances of resistant populations developing. Resistance to fungicides has been reported in Microdochium in the USA.
- Use flat fan nozzles for better spray coverage versus nozzles producing larger droplets, check product label for more details.
- Bayer solutions – both Interface® Stressgard and Dedicate® provide effective preventative and curative control.