Dollar Spot Risk Increasing With Higher Temperatures And Humidity

Cool spring temperatures are gradually warming and when combined with higher humidity and/or rain, are creating conditions very conducive to dollar spot. A spring application of fungicide targeting dollar spot can reduce long-term dollar spot incidence, but controls will still be needed throughout the season to minimize damage.
  • Long-term cultural management strategies
    • Reduce surface moisture with morning mowing, rolling, dew-whipping, or dragging a hose.
    • Light rates of quick release N will also help limit dollar spot. Rates as low as 0.1 lb. N/1,000 sq. ft./7-14 days are recommended for greens with higher rates for fairways.
  • Avoiding fungicide resistance
    • Dollar spot resistance to various fungicide classes has been documented.
    • Maximize cultural practices to minimize dollar spot incidence.
    • Avoid exclusive use of the same fungicide or fungicides with the same mode of action or FRAC code, this is especially important now with the eight different active ingredients in the SDHI family.
    • Alternate or tank-mix fungicides from different modes of action or FRAC codes.
    • Alternate or tank-mix contact fungicides with systemic fungicides.
  • More information – See the attached Bayer Solutions Guide below and contact your Bayer Area Sales Manager if you need assistance.

Dollar spot mycelium on fairway height creeping bentgrass. Photo: Zac Reicher, Ph.D., Bayer.

  Bayer Solutions - DollarSpot - COOL
Zac Reicher

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

Monday, June 04, 2018

Paul Giordano

by Paul Giordano , Ph.D., Green Solutions Team Specialist

Monday, June 04, 2018