Symptoms occur in southern rice areas. The main damage occurred in leaf sheaths and leaves, and the leaf sheaths on the diseased leaf surface of the diseased leaf were the first to develop disease. They began to appear wet, black, and then gradually expanded into 2-3cm elliptic or spindle-shaped lesions covered with brown to dark brown veins. In the late stage, leaf sheaths of flag leaves are often endangered, and the leaf sheaths turn yellow-green. There are often gray and white granular calcareous sclerotia in the leaf sheaths, which are generally not soft rot. The leaf tip of the diseased leaf is yellowed first, and then spreads along the two sides of the vein. The diseased sheath often contains white mycelium and calcareous granular sclerotia, and the surface is white mold, ie pathogenic mycelium and conidia, and the latter disease. The leaves fade gradually from the tip of the leaf to yellow. In production, this symptom is often confused with the discolored leaf sheath caused by the infestation of the young larvae of S. indicum, and attention should be paid to the distinction.

The pathogen Cylindrocladium scoparium Morgan et Aoyaqi is called a sporotrichum paracasei, which is a fungus belonging to the subphylum Fungi. The pathogenic conidiophore stalk is colorless, with 2-3 forked or round branching pedicels, on which conidiospores develop. Conidia are colorless, cylindrical, with a septum, size 49-763-5 (μm). The growth temperature of pathogens is 5-35°C, and the optimum temperature is 25-35°C. In addition to damaging rice, it can also harm barley and buckwheat.

The route of transmission and the route of transmission of disease conditions are still unclear. The initial observation of the disease was prevalent before and after the period from the peak to the jointing stage of rice tillering, poor drainage, and long-term depth of irrigation.

The incidence of water in the field is heavy, and the incidence is the most in June. The difference in disease resistance between varieties is obvious, and japonica rice is more resistant to disease.

Prevention methods (1) Disease areas should pay attention to the selection of disease-resistant varieties. (2) Strengthen the management of fertilizers and waters, drain them in time, and timely treat the diseased grass to prevent the spread of the disease.

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