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Black Streaks in Zoysia: Spring Thatch Decomposition

Black streaks in spring zoysia are fungi decomposing dead blades/thatch. No fungicide needed. Prevent by fertilizing after May 1, watering 1 inch weekly only when dry, mowing 1.5–2 inches weekly, and aerating in May.

About Gardening: Weed ID Required Before Any Herbicide in Zoysia; Zoysia Grass in New York: The Trade-Offs of a Warm-Season Lawn in a Cool Climate; Identifying Black Spots on Grass: Sooty Mold vs. Puffball Spores; Zoysia Grass Plugs: Meyer, Emerald & El Toro for Every Climate; Zoysia Mowing Height: Recovering from Scalping; Identifying Zoysiagrass: Late Green-Up, Stiff Blades, Slow Growth; Zoysiagrass Winter Fertilization: Question the November Application; Overseeding Thin Zoysia in Shade: Don't Waste Your Money; Fixing the Two-Tone Green Look in Emerald Zoysia; 'Zeon' Zoysia for Shade: Outperforms Bermuda Under Shade Cloth

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