It’s go time for snow mold prevention

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Winter is almost upon us in the northern United States or at higher elevations and it’s time to make what is likely the most important application or applications of the year. Here’s some last-minute advice.

  • Check calibration and spray coverage – A full season of applications may wear out or plug nozzles and the impact won’t be visible until next season
  • Protect compromised turf – snow mold is especially damaging on stressed turf
    • Newly established turf, shaded areas, compacted clean-up and traffic areas, under-fertilized, and otherwise compromised areas may be more susceptible to snow molds (photo)
    • Late season hollow-tine aerification, breaking up plugs, and then topdressing is exceptionally stressful on turf. If these practices are getting too late in the season to heal before the snow mold application, consider delaying aerification until next spring or switching to solid tines to minimize stress
  • Hold off on the final application – Until top growth ceases to minimize fungicide loss in clippings
  • Consider a primer application – While snow mold symptoms typically appear in spring following snow melt, sclerotia begin to germinate in the fall at air temperatures of 50-65°F. As with other diseases, minimizing inoculum with early applications is critical for long-term success. A DMI fungicide applied two or more weeks prior to the final application will maximize control in high pressure areas. Bayer’s latest DMI, Densicor®, has been highly effective for this application
  • Use multiple active ingredients – Three or more active ingredients in a fungicide application consistently provide better snow mold control than applications with only one or two active ingredients
  • Consider reapplying after heavy rain – If two or more inches of rain falls between the final fungicide application and snow cover, consider making an additional application on high value areas to maximize disease control and ensure a successful start to the 2023 season
  • 2022 Envu solutions – Use combinations of Interface® Stressgard®, Mirage® Stressgard and/or Tartan® Stressgard, which provide effective and consistent control of snow molds as well as improved turf quality in the spring (Figures). Adding Densicor, Turfcide® (AmVac) and/or Daconil Weatherstik® (Syngenta) adds another mode of action and further improves consistency of control in particularly challenging environments.
Less than 80 days of Snow Cover (Mainly pink snow mold) Product and Use Rate per 1,000 sq. ft. Less than 80 days of Snow Cover1,2 (Mainly pink snow mold)
Product and Use Rate per 1,000 sq. ft.
80 days or more of Snow Cover1,2 (Mainly gray and speckled snow mold)
Product and Use Rate per 1,000 sq. ft.
Interface Stressgard 6.0 fl. oz.
or
Interface Stressgard 3.0. fl. oz. +
Tartan Stressgard 1.0 fl. oz.
Interface Stressgard 6.0 fl. oz. +
Mirage Stressgard 2.0 fl. oz. +
Densicor 0.196 fl oz and/or
Turfcide 400 (PCNB) 6.0 fl. oz. or
Daconil Weatherstik 5 oz.
or
Tartan Stressgard 1.0 fl. oz. +
Mirage Stressgard 2.0 fl. oz. +
Interface Stressgard 3.0 fl. oz. +
Densicor® 0.196 fl oz and/or
Turfcide 400 (PCNB) 6.0 fl. oz. or
Daconil Weatherstik 5 oz.

1 Do not exceed Mirage 1 oz/1000 sq feet/application or 3 oz/1000 sq ft/year in New York state
If your Envu Preventative Snow Mold Program performance expectations are not met, just contact your Envu Distributor or Envu Area Sales Manager.

 

  • Need more info?  Read and follow all label directions.Contact your Envu area sales manager if you need assistance.


Rain and snow melt can reduce persistence of snow mold fungicides, consider reapplication if significant rainfall occurs after final application and permanent snow cover 

Rain and snow melt can reduce persistence of snow mold fungicides, consider reapplication if significant rainfall occurs after final application and permanent snow cover (Envu)

Zac Reicher

by Zac Reicher , Ph.D., Green Solutions Team Specialist

Friday, October 28, 2022