烟草白粉病(Erysiphe cichoracearumDC)是长期危害我省烤烟的主要病害。全省烟区每年都有不同程度的发生,受害烟叶烘烤后病部褐枯而失去经济价值。在发病多的弥渡、祥云、姚安、楚雄、通海、弥勒、建水、宜良、路南等地,每年约有10万亩烟地发病,烟叶受害减产5—10%,品质下降近一个等级。为了有效地防治白粉病,提高云烟的品质,作者自1978年起对该病害的发生过程,田间病情消长与气候、栽培条件的关系,防治方法等进行了研究,边研究边向生产提供防治措施,取得了一定的效果,现报道如下: Tobacco powdery mildew (Erysiphe cichoracearumDC) is a long-term harm to our province the main disease flue-cured tobacco. The tobacco smoke area in the whole country takes different degrees every year, the cured tobacco leaves lose their economic value after the tobacco leaves are brown and dry. In the incidence of more Midu, Xiangyun, Yaoan, Chuxiong, Tonghai, Maitreya, Jianshui, Yiliang, South Road and other places each year about 100000 mu of smoked land disease, tobacco damage reduced by 5-10%, the quality dropped by nearly one grade. In order to effectively control powdery mildew and improve the quality of cloud tobacco, the author studied the process of the disease, the relationship between the growth and decline of the disease in the field and the climate and cultivation conditions and the prevention and treatment methods since 1978, , Achieved some results, are reported as follows: