摘要
1980～1997年对河南小麦白粉病春季流行的时间动态进行了系统分析。结果表明:(1)逐年春季流行程度波动较大,中度以上流行年份有9年,但流行程度之间没有明显的周期性。(2)逐年春季流行的时间动态有明显差异,特大流行年份白粉病发病特早,指数增长期和逻辑斯蒂期比其它年份长30d以上,表观侵染速率达0.16以上;大流行年和中度流行年份的始发期相同,表观侵染速率前者达0.16,后者只有0.12～0.14;轻度流行年始发期晚,指数增长期和逻辑斯蒂期短,表观现侵染速率低,导致最终病情指数低。(3)小麦越冬返青期的降水量、雨日、水份积分指数、相对湿度对白粉病的始发期有显著影响,但白粉病的最终流行程度主要取决于小麦拔节孕穗期的水份积分指数、温雨系数、降水量、雨日和温度。
The temporal dynamic of annual epidemic of wheat powdery mildew in Henan during 1980- 1997 and the effect of climatic factors on the epidemic were analyzed .The result showed: ( 1) The annual epidemic degree fluctuated greatly. The epidemic was over medium in nine years out of 18. (2) There was great difference in the temporal dynamic of annual epidemic. The powdery mildew onset phase was very early in heavy epidemic years.The exponential and the logistic phases were 30d longer than the other years and the average apparent infection rate ( r ) reached 0.16. The onset phase in the medium and the heavy epidemic years was similar but the r-value was 0. 12 -0. 14 for the medium epidemic years. The index of disease was low due to the delayed onset phase, the shorter exponential and the logistic phases and low r. (3) The onset phase of powdery mildew was influenced by the rainfall capacity (Rc) , the rainfall duration(Rd) , the relative humidi-ty(RH), and the water integral index (Q) at stage of turning green. Q, Rc,, Rd, T( temperature) and ER(temp. rainfall coefficient) were the main factors decided the epidemic of wheat powdery mildew.
出处
《植物保护学报》
CAS
CSCD
北大核心
2000年第3期238-242,共5页
Journal of Plant Protection
基金
国家"八五"科技攻关项目(85-10-01-02-01)
关键词
小麦白粉病
春季流行
时间动态
侵染速率
河南
wheat powdery mildew, annual epidemics, temporal dynamic, apparent infection rate
