烟草花叶病是旬阳烟区的主要病害。近年来,发病株率成倍增加,为害程度不断加剧。2000年全县80%的烟田发生花叶病,其中达到三级以上发病程度的面积占30%左右,有20%烟田绝收,仅此一项,全县减收烟叶3500t,直接经济损失高达2000万元以上。控制该病的发生为害,已成为夺取烟叶丰收的 Tobacco mosaic disease is the main disease in Xunyang tobacco area. In recent years, the rate of diseased plants has doubled and the degree of damage has been increasing. In 2000, 80% of the tobacco fields in the county were affected by mosaic disease, of which 30% were affected by diseases above the third grade, and 20% were non-smoking tobacco crops. Up to 20 million yuan. Control the occurrence of the disease, has become the harvest of tobacco leaves