烟草白粉病流行因素及防治对策

Epidemic Factors and Control Measures on Powdery Mildew in Tobacco

结果表明：不同烤烟品种间对白粉病存在明显的抗感性差异；密度过大、氮肥施用过多和地膜栽培有利于烤烟白粉病的发生；日照不足、温湿度适宜于白粉病分生孢子萌发是造成该病流行的主要因素。在发病初期喷施粉锈宁１０００倍液具有较好的防治效果。

The results of field test showed that there were significant difference on resistance to powdery mildew among tobacco varieties. High plant density, over nitrate fertilizer application and use of plastic mulching were favorable to the incidence of powdery mildew. The main factors to cause the disease epidemic were shortage of sunlight and optimal temperature and humidity to condia spore germination. The disease could be controlled effectively by spraying 1∶1000 Tridema liquor.