Smut disease of Zizania latifolia mainly damages leaf sheath and Zizania latifolia. At the early stage of the disease, the lesion on the leaf sheath was dark green dots, and then it developed into an oval tumor-like process. At the later stage, the leaf sheath was full of black spores, which made the leaf sheath black. When the pork is diseased, smut fungus is full of water bamboo tissue, which makes the middle bulge and bulge, shortens the water bamboo body, and has many longitudinal grooves on the outer surface, which is rough and does not crack when it grows old. Black spore piles can be seen in cross section, which is inedible and becomes a common ash bamboo.

The control measures are as follows: first, select the seeds and remove the ash. The second is to strengthen management. In spring, old piers should be cut and pressed to reduce the tillering node position of plants; When the old pier germinates, the over-dense tillers are removed to promote the germination orderly; The water layer should be well managed, shallow irrigation should be done before tillering, the field should be put aside in the middle period, and deep irrigation should be done in the high temperature period to inhibit ineffective tillering; Rational fertilization, on the basis of adequate basal fertilizer application, timely topdressing in early stage to promote tillering growth, appropriate topdressing control in high temperature period to inhibit late tillering, timely removal of yellow leaves in summer and autumn, and improvement of ventilation and light transmittance among plants.