Recommended fungicides can help prevent further infection while corrective cultural measures are taken. Reduce soil compaction through aeration by using lightweight equipment. Apply low amounts of nitrogen in the spring when roots are forming. Reduce mowing frequency and use lightweight mowers. Apply optimum amounts of nitrogen, phosphorous and potassium. ControlĬorrect over-watering and/or drainage problems. Webbing may be evident early in the morning in some turfgrass species. Turfgrass in affected spots dies rapidly, collapses, and appears oily and matted. Small, irregular spots may enlarge and appear dark and water-soaked in early stages. Several Pythium species favor temperatures between 32 degrees F and 50 degrees F while others thrive in temperatures between 70 degrees F and 90 degrees F. Conditions promoting diseaseĮxcessive soil moisture caused by over irrigation or heavy rain showers. Pythium Causal agentĪnnual bluegrass, tall fescue, perennial ryegrass and varieties of bentgrass, bermudagrass, centipede, zoysiagrass and St. ![]() Irrigate deeply and infrequently to avoid drought stress. Irrigate turf early in the day to allow the foliage to dry as quickly as possible. Use an adequate level of nitrogen, particularly in the spring and early summer. Controlįertilize as necessary water adequately. Abundant white fungus growth may be seen in these areas during periods of severe disease development which is evident early in the morning when dew is present. Lesion moves across blade, causing tip to dieback. Live blades may have straw-colored lesions along one edge. SymptomsĬircular straw-colored infection centers are only a few inches across, although spots may merge, resembling brown patch. Conditions promoting diseaseĭry soil conditions, extended leaf wetness and low nitrogen levels in soil. Tall fescues, Kentucky bluegrass, perennial ryegrass, bentgrass, centipede, zoysiagrass and bermudagrass hybrids are particularly susceptible. Suceptible turfgrassesĪll species of warm- and cool-season turfgrass are susceptible. Increase the height of cut and increase the air circulation. Avoid nitrogen application when the disease is active. Use low amounts of nitrogen, moderate amounts of phosphorous and moderate to high amounts of potash. ControlĬorrect water problems don't over-fertilize. ![]() Webbing may be evident early in the morning. Augustinegrass, patches appear straw-colored. In bermudagrass, centipede, and ryegrass, patches are brown. Leaf blades or sheaths are blighted in circular patches measuring inches to feet across. Excess soil moisture, extended leaf wetness, and/or high levels of nitrogen increase severity of the disease. Brown patch is favored by high relative humidity during the day and a minimum temperature of 65 degrees F at night. The most favorable conditions for disease development usually occur from late April through October. Augustinegrass, zoysiagrass, bentgrass, ryegrass, tall fescue, centipede and bermudagrass. The disease can infect all species of warm- and cool-season turfgrasses, including St. ![]() Alfredo Martinez, Extension Plant Pathologist
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