一 普查病情的时间:根据以往的经验教训,我们认为,在山西夏县地区今后秋季查治适期应在11月中旬到12月中旬;春季查治应在3月中旬到4月10日;后期大田防治适期以4月25至5月15日为宜。 二 群众性普查的方法和技术:一般采用的调查方法:有用取点调查的,这种方法比较粗 A survey of the disease time: Based on past experience and lessons, we believe that in the future Xiaxi County, Shanxi Province, check the appropriate period should be in mid-November to mid-December; check the spring should be in mid-March to April 10; Late field prevention and control period April 25 to May 15 is appropriate. Two mass census methods and techniques: General survey methods used: useful point of investigation, this method is relatively crude