The impact of Northern Hemisphere polar vortex area and Eurasian meridional circulation on the epidemic of wheat power mildew is negative, while the impact of Indiaburman trough and West Pacific Subtropical high area is positive.

• 北半球极涡面积和欧亚经向环流对我国小麦白粉病流行影响为负效应，印缅槽和西太平洋副热带高压面积对我国小麦白粉病流行影响为正效应；