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May 25, 2023

Techs On Turf– Diagnose & Treat Pythium

How to Diagnose and Treat Pythium

Temperatures are starting the climb in both the northern and southern states. This means one thing; we need to start thinking about pythium pathogens (blight, root dysfunction, root rot, damping off). Which are some of the most destructive diseases, in both cool and warm season turf. Pythium starts to show up when temperatures are above 65°F in cool season turf and 50°F in warm season turf. Leaves also need to be continually wet for 12 to 14 hours for several consecutive days.


The active ingredient of Quali-Pro Gateway is cyazofamid, which prevents pythium spores from germinating. Gateway is a FRAC 21 fungicide that can be applied up to 3 times per year at the maximum labeled rate of 0.9 floz. / 1,000 ft2 on professionally managed turfgrass. We recommend preventative applications to manage turf, as the weather conditions turn towards hot and humid. Anticipate 7-28 days of control with a preventative application, with the longevity dependent of environmental conditions. It is best to alternate FRAC codes of fungicides in a preventative program, to prevent future turf disease resistant populations from developing. Quali-Pro Mefenoxam 2 AQ is a FRAC 4, which is an alternative chemical class, can be used as a rotational fungicide for pythium management in professionally managed turf.


Quali-Pro Gateway is generally compatible with other pesticides, wetting agents and fertility products used in professional turf management, although a jar test is always recommended prior to making an application.

*Confirm the label use rate and state registration prior to use.

Quali-Pro Gateway

Use Rate                                  0.45 – 0.9 floz. / 1,000 ft2

Max application per year        3 at high rate

Longevity of control                7-28 depending on environmental conditions

Bobby Kerr, Ph.D

Bobby Kerr, Ph.D. T&O Technical Services Manager

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