Identification and control of sheath blight of Zizania caduciflora

Rhizoctonia esculenta is a common disease of Zizania latifolia, and its harm tends to be aggravated year by year. It mainly damages leaves and leaf sheaths, forming water-stained, dark green to yellow-brown cloud-like spots. At high humidity, the diseased part produced sparse light brown mycelium, and then formed early white, gradually changed to yellow brown small sclerotia. Occurrence characteristics: Pathogen for the semi-known subphylum Rhytichophyta. 25~32℃ and rainy days are favorable for the disease, and there are many sclerotia in continuous cropping soil, and the disease is serious. Control methods: ① Implement more than 3 years of rice-paddy rotation.② Reasonable dense planting; combined with farming operations such as intertillage, timely remove lower diseased leaves and yellow leaves, and improve ventilation and light transmission conditions. 3. Apply enough basal fertilizer, appropriate topdressing and more phosphorus and potassium fertilizer. 4. Spray 5% Jinggangmycin 1000 times solution and 50% carbendazim 800~1000 times solution at the early stage of disease.