![]() The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by NC State University or N.C. Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. ![]() High = Rotate to different chemical class after EVERY application tank-mix with low or medium risk product for EVERY application Medium = Rotate to different chemical class after 1-2 applications tank-mixing with low or medium risk product recommended Low = Rotate to different chemical class after 3-4 applications tank mixing not necessary + = good control when disease pressure is low ++ = good control when disease pressure is moderate, excellent control when disease pressure is low +++ = good control when disease pressure is high, excellent control when disease pressure is moderate ++++ = excellent control when conditions are highly favorable for disease development * Products marked with an asterisk are not labeled for home lawn use. Products with same code have the same mode of action and are in the same chemical class. ![]() Use lower rates for preventive and higher rates for curative applications.ģ Use shorter intervals when conditions are very favorable for disease.Ĥ Fungicide Resistance Action Committe code. Apply fungicides in 2 to 5 gallons of water per 1,000 square feet according to label directions. Pyraclostrobin + fluxapyroxad (Lexicon Intrinsic)ġ Other trade names with the same active ingredients are labeled for use on turfgrasses and can be used according to label directions.Ģ Units are oz, fl oz, or lb depending on formulation. Pydiflumetofen + azoxystrobin + propiconazole (Posterity XT)* Pseudomonas chlororaphis strain AFS009 (Zio) Mefentrifluconazole + pyraclostrobin (Navicon)* Applications should be initiated when night temperatures consistently exceed 65☏ for cool-season turf (50☏ for warm-season turf) and repeated on 14 to 21-day intervals as directed on the fungicide label when conditions are favorable for Pythium blight development.Īzoxystrobin + acibenzolar-S-methyl (Heritage Action)* Bermudagrass putting greens are susceptible to Pythium blight during extended periods of humid, rainy, and or cloudy weather most anytime of the year when temperatures are above 50☏.Ĭhemical Control Skip to Chemical Controlĭue to the potential for rapid development of this disease, high value areas and susceptible grasses should be protected with a preventive fungicide program. Creeping bentgrass and tall fescue are more resistant to the disease, but can be severely affected if conditions are conducive for prolonged periods. Perennial ryegrass and annual bluegrass are most prone to Pythium blight and can sustain significant damage in 2 to 3 days when conditions are favorable. Excessive soil moisture and succulent foliar growth also favor disease development. Daytime temperatures above 85☏ also encourage Pythium blight development in cool-season turf, possibly due to increased stress. For this reason, severe Pythium blight epidemics in cool-season turf are commonly observed the morning after a late afternoon or early evening thunderstorm in the summer. Pythium blight may develop when night temperatures exceed 65☏ in cool-season turf (50☏ for warm-season turf) and leaves are continually wet for 12 to 14 hours for several consecutive nights. Development Factors Skip to Development Factors
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