1. feature

The lawn was spotted with round spots. The infested leaves began to appear immersed in water and darkened, finally dried up, and turned dark brown. The lesions had a diameter of up to 2 m. A black smoke circle may appear on the edges of grass patches in the early morning lawn.

2. Hazardous object

Ryegrass, tall fescue, bluegrass, and bentgrass.

3. Control methods

(1) pay attention to drainage, low N fertilization. (2) Prevention and control of enemy mycelium, chlorothalonil, and zein zinc.

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