小麦白粉病是商洛地区小麦三大病害之一，常年发生面积在２．６７～４．０万ｈｍ２。１９９８年由于气候等因素极为有利，使其在商洛地区大流行，为８０年代以来最严重的一年。全区发生面积达６．４４万ｈｍ２，占小麦总面积的６６．６％，损失率在２５％左右，损失粮食３... Wheat powdery mildew is one of the three major diseases of wheat in Shangluo region. The perennial occurring area is between 2.67 and 40,000 hm2. In 1998, it was considered as a major cause of ill effects in the Shangluo region and was the most serious since the 1980s Year The area of ​​?? 64,400 hm2 occurred, accounting for 66.6% of the total area of ​​wheat, the loss rate of 25%, loss of food 3 ...