近几年来,水稻霜霉病在湘北局部地区有一定的发生与为害。早、中、晚稻上均可发生,尤以中稻发病较重,发病品种主要是汕优系列和二系杂交稻。同时,随着化学除草技术的大面积推广应用,受多种因素影响,水稻除草剂药害也常有发生。水稻霜霉病症状和除草剂药害症状有许多相似之处。? In recent years, rice downy mildew in some areas of northern Hunan have a certain occurrence and damage. Early, middle and late rice can occur, especially in the heavier incidence of middle-season rice, the main varieties are Shanyou series and two-line hybrid rice. At the same time, with the large-scale popularization and application of chemical weeding technology, rice herbicide phytotoxicity often occurs due to many factors. Symptoms of rice downy mildew and herbicide have many similarities. ?