
Summer Patch & Necrotic Ring Spot
Summer Patch & Necrotic Ring Spot Turfgrass Disease Hot weather diseases (over 75 F) When will it appear? Late spring-early summer The fungus attacks soil at 70F Excessive watering, heat
Summer Patch & Necrotic Ring Spot Turfgrass Disease Hot weather diseases (over 75 F) When will it appear? Late spring-early summer The fungus attacks soil at 70F Excessive watering, heat
Pythium Blight Turfgrass Disease Hot weather diseases (over 75 F) When will it appear? July-August Hot: day temp >85F night temp >75F Wet turf and high humidity Poorly drained soils,
Gray Leaf Spot Turfgrass Disease Hot weather diseases (over 75 F) When will it appear? End of July-August Hot, Humid Weather Most severe in newly established plantings Prolonged hot (82-90F)
Rust Turfgrass Disease Hot weather diseases (over 75 F) When will it appear? July- October Warm temperatures (70-95F) Humid Water, heat or other stresses will cause symptoms to be more
Helminthosporium Leaf Spots Turfgrass Disease Warm weather diseases (60-75 F) When will it appear? Caused by many different kind of fungi Leaf spot may appear during most of the growing
Dollar Spot Turfgrass Disease Warm weather diseases (60-75 F) When will it appear? June-September Hot, humid days cool nights Dew Nitrogen Deficient Plants affected? All grasses Most serious on closely
Powdery Mildew Turfgrass Disease When will it appear? April-May, October-November Shaded, wind-protected turf Cool/Warm (61-77F) Tall turf (>3inches) Plants affected? Bluegrass (Kentucky & Annual) Fine-leaf Fescues Symptoms? Circular patches Diffuse
Yellow Patch Turfgrass Disease Cool weather diseases (45-60 F) When will it appear? Spring or fall Cool temperatures (40-65F) Moist conditions Plants affected? Creeping bentgrass and bluegrass are most susceptible
Fair Rings Turfgrass Disease Cool-weather diseases (45-60 F) When will it appear? April- October Lush Grass Thick Thatch Rings will develop in the same areas each year Plants affected? All
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