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Pythium lawn disease3/1/2024 ![]() May increase this disease on tall fescue. Do not use with foliar fertilizers of copper-based materials. Do not mow or irrigate until sprays have dried. Fiata Stressgard at 5 to 15 fl oz/1,000 sq ft.Chipco Signature at 4 to 8 oz/1,000 sq ft.Also labeled for soil drench, see label for details. Organocide Plant Doctor at 5 to 10 fl oz/1,000 sp ft as a foliar spray.Limit the use of any one group during crop production. Promoting vigorous root growth and reducing stress can help minimize severe damage.Ĭhemical control To prevent developing resistant fungi, alternate or tank-mix materials from different groups with different modes of action.Treat surface irrigation water to kill spores. Avoid overwatering and watering late in the day. Provide good surface and subsurface drainage when establishing turf. Water management is important in reducing disease potential.During warmer summer periods, symptoms may appear first as small, tan, brown, or bronze patches of turf, which may converge to form large areas of wilted, dying turf. During cooler periods, such as early spring or late fall, symptoms may appear first as small, diffuse, yellow patches that coalesce into large yellow areas. Symptoms Small patches or large turfgrass areas may appear thin, off-color, and slow growing. These organisms can be found in surface waters and survive through the irrigation system. A thick-walled survival structure, oospores, are produced that can persist for several years. After infection, the microorganism spreads mainly in the inner tissues of the roots. Under favorable conditions, spores germinate and infect roots. They survive unfavorable periods in soil and infected plant debris. graminicola, fungal-like microorganisms favored by wet, flooded conditions.
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