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David from Marietta, Ga writes

What application rate is required for prevention of pythium blight for tall fescue grass??

My tall fescue lawn has been diagnosed with pythium blight for the last two seasons. What application rates and periods of application are recommended for prevention and for control of pythium blight.


Use Monterey Garden Phos Systemic Fungicide for effective control of Pythium and damping-off diseases of turf grasses. When conditions favor disease, begin preventative applications and repeat at indicated intervals. Use higher rate of application when disease pressure is severe.  Per the product label the rate is: 5 to 10 fl. oz. per 1,000 sq. ft.  Apply indicated quantity of product in 1 to 5 gallons of water per 1,000 sq. ft. Ensure foliage is thoroughly wet. Application intervals: 14 to 21 days. Repeat as required. Do not irrigate or mow treated areas until spray has completely dried.

Answer last updated on: 03/23/2020

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