旱地烟草青枯病发生规律及药剂防治试验

Study on Occurrence Regulation and Control Measures of Tobacco Bacterial Wilt

对湘南烟区旱地烟烟草青枯病的发生规律及药剂防治效果进行了研究,结果表明:湘南烟区旱地烟烟草青枯病发病的始发期为5月上旬,随着5月下旬日平均气温达到25℃,烟草青枯病进入盛发期,发病高峰期间定点观测田发病率平均日增长率最高为4.56%,病情指数平均日增长率最高为4.10。6种防治烟草青枯病药剂田间试验结果表明,各处理对烟草青枯病均有一定的防治效果,但在发病高峰期防治效果均低于45%,其中以青萎散DP 750 g/667 m2防治效果最佳。

The occurrence regulation and control measures of tobacco bacterial wilt were studied. The results showed that beginning period of tobacco bacterial wilt was first ten days of May. With average temperature reached to 25℃ in late May, tobacco bacterial wilt entered on a full incidence period： Maximum daily average increase rate of incidence was 4.56%, Maximum daily average increase rate of disease index was 4.10. The field results showed that six agrichemical agents all had certain control effects, of which the best was Qingweisan DP 750 g/667 m^2, but all lower than 45% during peak incidence period.