In recent years, weedy rice has appeared one after another in the paddy fields all over the world, which directly lead to the reduction of yield and quality of the paddy fields, and even the loss of harvest in the seriously damaged paddy fields. This kind of weedy rice is domesticated and adapted to the environment through genomic variation and has a strong growth advantage that normal rice does not have. 
Weedy rice grows with the growth of rice, and when the land is changed to other crops, it will immediately dormant until the land is replanted and revived.
 many people think that their existence will seriously affect the yield of normal rice.