How are you managing Microdochium patch?

Known as one of the most common diseases on golf courses in British Columbia, Microdochium patch requires a plan to manage it. Now is the time to review your preventative management plan for this disease on cool-season grasses as we move into cooler weather. This year’s plan should recognize recent changes introduced by the PMRA and any necessary adjustments to make managing Microdochium patch as seamless as possible.

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Make a plan

A preventative management plan that combines cultural practices and fungicide application is necessary for Microdochium patch in the Pacific Northwest. Management tactics will need to be adjusted throughout the season because the disease can be especially tough on cool-season turf from late summer through spring in British Columbia. It can harm all cool-season grasses, but is most damaging on low mown annual bluegrass. Once turfgrass growth slows, it becomes very difficult to get rid of Microdochium patch symptoms until warmer temperatures prevail in early spring. Here are some recommended cultural practices and fungicide considerations for your management plan.

Cultural practices
Maintain low soil pH – below 6.5
Control excessive thatch with cultivation practices
Remove morning dew, improve air movement and provide adequate drainage
Roll when not mowing – rolling can reduce Microdochium incidence
Balance soil fertility and increase Sulphur fertilization to 2.5 lb./1,000 ft2 per year

Fungicide considerations
Initiate fungicide applications once air temperatures fall below 15⁰C
Rotate modes of action to actively manage fungicide resistance
Apply fungicides every 28 days – intervals may need to be shortened during peak pressure
Enhance control using pre-mix fungicides or tank-mix fungicide combinations 
Ensure your fungicide program is compliant with new PMRA regulations

New PMRA regulations

Iprodione based products – all Iprodione based products, including Interface™ Stressgard® and Trilogy® Stressgard® must be used by June 21, 2021. All purchases must have been made by June 21, 2020.
Chlorothalonil based products – all applications of chlorothalonil based products at rates labeled for snow mould must result in the immediate closure of treated areas to the public. This affects Instrata®, Daconil® and other generic formulations containing chlorothalonil.
Click here for more information on PMRA regulatory changes with these active ingredients.

Bayer solutions

Dedicate™ Stressgard®, Interface Stressgard and Trilogy Stressgard are all outstanding solutions for managing Microdochium patch on your golf course. These fungicides can all be incorporated into a comprehensive fungicide program and offer excellent and curative control against this persistent disease while enhancing turfgrass colour, quality and density with Stressgard formulation technology.

Interface and Trilogy can also help turf recover from pink snow mould damage following snow melt.

Remember – Interface and Trilogy can be used to control Microdochium patch until June 21, 2021.

A comprehensive fungicide program should include multiple modes of action while practicing fungicide rotation. Fungicides should be applied preventatively as temperatures begin to cool in early fall. Maintain applications if environmental conditions remain conducive for Microdochium patch development.

Below is an example of a fungicide program designed for effective season-long disease control of Microdochium Patch throughout the fall, winter and spring months. This program is a suggestion only, based on consistent disease pressure throughout the season. Always refer to product labels for specific instructions for each application.

For more information about disease and insect control strategies, contact your local Territory Sales Manager

@BayerGolfCA 1-888-283-6847

Bayer, the Bayer Cross, Dedicate Stressgard, Interface Stressgard, Trilogy Stressgard are trademarks of Bayer.