As can be seen from the figure, before rice was flooded, it was infected with bacterial brown rot, the weather turned fine, the temperature rose, and the infected heart leaves could not absorb water and died. It is suggested that the field water should be drained, re-irrigated with shallow water and topdressing. After mixing diclazole+agricultural streptomycin+brassinolide+amino acid foliar fertilizer with water, it should be sprayed on the leaves twice, with an interval of 4-5 days.