摘要
在自然发病条件下，抽穗扬花期，小麦白粉病病情指数与染病小麦千粒重下降率有极显著正相关，ｙ＝－１．０３１７＋３．８５５７ｌｎｘ±２．７４１７。抽穗期无论病指高低，后期病害流行速率相近。此时应用粉锈宁防治，防治指标为：病情指数１．８３。
Under the natural conditions, the disease index infected by the wheat powdery mildew has significantly positive correlation to the reduced rate of 1 000 kernels' weight ,y=-1 031 7+3 855 7 lnx±2 741 7. And the epidemic rate of the disease is similar after heading stage, whether the disease index in heading stage is high or not. The ELT of the wheat powdery mildew is 1 83 in disease index.
出处
《植保技术与推广》
1997年第2期3-5,共3页
Plant Protection Technology and Extension
