禾谷类霜霉病(Sclerophthora macr-ospor(Sacc)Thirum et al)是汉中地区近年来所发生的一种病害。特别是水稻和小麦的霜霉病,1973年以来,曾先后在较大面积流行多次,局部地区造成严重损失,成为生产上一个不容忽视的问题。 调查证知:稻、麦在其生长期淹水是发生霜霉病最主要的诱发条件。病情的轻重,随淹水时期、持续时间、深度和次数的不同 Sclerophthora macrosporidium (Sacc) Thirum et al is a disease that occurred in Hanzhong area in recent years. In particular, downy mildew in rice and wheat has been endemic in large areas many times since 1973 and has caused serious losses in some areas. This has become a problem that can not be ignored in production. Survey shows that: rice, wheat in its growth period flooding is downy mildew the most important trigger conditions. Severity of illness, with the flooding period, duration, depth and frequency of different