夏季最热一旬平均气温高达２８．６℃时，关中西部新灌区麦辣间套田中自生麦苗上的小麦白粉病病菌仍可顺利越夏并成功侵染秋苗。春季２月中旬至３月下旬为病菌复苏期。３月下旬至４月中旬为病害流行发展期，４月上旬至５月初为病害流行加重期，４月中旬至５月中旬为病害流行盛期，５月下旬进入衰退期。当地栽培品种中目前尚无优良的抗病品种；防治可用粉锈宁拌种，适当推迟播期，加重期喷１～２次粉锈宁。 When the hottest average temperature in summer was as high as 28.6 ℃, the wheat powdery mildew pathogen could still succeed in summer and succeed in autumn seedling emergence. Spring mid-February to late March for the bacteria recovery period. From late March to mid-April, it was the disease epidemic development period, which increased from early April to early May, and peak disease prevalence from mid-April to mid-May. It entered the recession in late May. There are currently no cultivars with excellent disease resistance varieties in our country. Seedling powdery mildew can be used for seed dressing control, sowing date may be postponed as appropriate, and 1 or 2 times of triadimefon may be aggravated.