Change or alleviate patterns of wear and foot traffic.Raise the mowing height if possible and use rolling to maintain green speed.Irrigate to not extend leaf wetness and ensure good drainage.Improving drainage/reducing compaction is most important.Cultural practices for Pythium blight (identical to those for leaf spot):.These symptoms often appear as streaking due to the movement of Pythium spores by equipment or by surface water drainage. Symptoms - Small, sunken, red-orange to dark gray spots and streaks which can coalesce into greasy looking patches.ultimum when daytime temperatures are below 55-60 ☏, and high humidity plus extended periods of leaf wetness can incite severe damage and potential turf death in 24-48 hours. Low temperature Pythium blight - Caused by Pythium graminicola and P.Proper lab diagnosis of Pythium blight is important since control methods for Pythium are dramatically different from leaf spot. Bermudagrass greens are especially affected by Pythium blight when temperatures are cool and it can be mistaken for leaf spot since both occur at about the same time in fall, winter and spring. Cooperative Extension prohibits discrimination and harassment regardless of age, color, disability, family and marital status, gender identity, national origin, political beliefs, race, religion, sex (including pregnancy), sexual orientation and veteran status.Pythium blight is a feared foliar disease that can quickly and extensively impact golf greens. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. A&T State University nor discrimination against similar products or services not mentioned. 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. ![]() Pydiflumetofen + azoxystrobin + propiconazole (Posterity XT)*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. ![]() Pseudomonas chlororaphis strain AFS009 (Zio) Mefentrifluconazole + pyraclostrobin (Navicon)* Other fungicides should also be watered-in with at least 1⁄ 8 inch to drive the active ingredient into the root zone where the Pythium root rot pathogens are most active. To minimize the potential for foliar burn, ethazole must be watered-in immediately after application with at least 1⁄ 8 inch of water. For curative applications, first apply ethazole then follow with an application of cyazofamid, mefenoxam, or propamocarb 2 to 3 days later. Where this disease has been a persistent problem, apply labeled fungicides every 14 to 21 days during the growing season or when rainfall occurs for 2 to 3 consecutive days. Chemical Control Skip to Chemical Control
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