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Kosta from Macomb, Mi writes

What fungicide can be used in a 14-21 day rotation with Monterey Garden Phos Systemic Fungicide for treating pythium on cool season turfgrass? Can you overseed during or after the rotation?


If doing a preventative fungicide treatment for pythium using Monterey Garden Phos Systemic Fungicide, you could rotate with Heritigae SC (Class 11) or Propiconozole 14.3 (Class 3) before disease conditions are present.  If Pythium has already is already established and present in the lawn, it is more difficult to control. Subdue MAXX Fungicide would be a better fungicide for active pythium. Re-treat at 7 to 14-day intervals if conditions remain favorable for disease.  There is no waiting period for overeseeding. Make sure you are not mowing the lawn while the turfgrass is wet as this spreads the spores on the mower blades, reduce thatch and improve drainage with core aeration, increase air circulation and reduce the amount of shade which will limit the amount of time of foliar, occasional deep watering of the lawn is better than frequent light watering, do not water at night.  Please view our Pythium Treatment Guide for more information and product recommendations. 


Answer last updated on: 08/31/2021

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Monterey Garden Phos Systemic Fungicide

Monterey Garden Phos Systemic Fungicide

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