草坪禾草腐霉病是由腐霉菌（ Pythium sp.）引起的一种真菌病害，可以为害禾草各个生长时期的任何部位，造成植株褐变腐烂或枯死，湿度大时可产生大量白色或紫灰色棉絮状菌丝体，持续高温高湿条件下能在很短的时间内破坏大片草皮。土壤、灌溉水雨水、病残体、器械工具和人、动物等都可携带传播。以游动孢子产生的休止孢子萌发出芽管、侵染丝或卵孢子直接产生的芽管及侵染丝侵入寄主为害。主要防治措施是选好用地，改良土壤，加强肥水管理，种植抗耐病品种，或不同品种混种，药剂防治包括土壤处理、种子处理和药剂喷洒等措施。
Lawn grass Pythium is a fungal disease caused by Pythium sp., Which can damage any part of the growth stage of grass, causing browning rot or withering. When humidity is high, it can produce a lot of white or purple Gray cotton-like mycelium, under continuous high temperature and humidity conditions in a very short period of time to destroy large turf. Soil, irrigation water and rain, sick, equipment tools and people, animals, etc. can be carried spread. The spores germinated by zoospores germinated germinating tube, germ tube and infected silk directly infected silk or oospores into the host damage. The main prevention and control measures are selecting land, improving soil, strengthening fertilizer and water management, planting anti-disease-resistant varieties, or mixing different varieties. The pesticide control measures include soil treatment, seed treatment and pesticide spraying.