Wild rice powdery mildew is a variant of Mizuno. Mizo rice and wild rice are actually aquatic plants with the same root. Mizo rice is infected by the black powder fungus and cannot produce spikes and rice, but the plants of Mizo are free of disease, and the stems will continue to expand and gradually form a fusiform fleshy stem, forming a new plant - wild rice, which is a variant of Mizo rice. Water bamboo as a vegetable is loved by people, coupled with Zizania is difficult to harvest, and low yield, leading to people are more willing to accept high yield, good harvest of water bamboo, water bamboo became a dish; Zizania was instead doubly cold, and gradually declined, by the grain became a medicinal herbs.