川北地区烟草黑胫病流行规律及防治研究

STUDIES ON THE EPIDEMIC LAW ANDCONTROL OF TOBACCO BLACK SHANK INTHE NORTH AREA OF SICHUAN PROVINCE

对感病品种Ｋｙ１４白肋烟黑胫病流行规律及防治方法研究表明，在四川北部地区，烟草生长季节（５～７月）的气候条件适宜黑胫病发生。其流行时间动态模型方程式为：Ｘ＝１－１４５ｅ－０．２１２３ｔ。从发病初期开始，每隔７～１０天喷施４３％甲霜铜８００倍液，共３次，并结合田间开沟排水等措施，对黑胫病的防效可达８０％～９０％。

The paper studied the epidemic law and control of the tobacco black shank with the susceptible varietyWhite Vein Tobacco Ky14 in the north area of Sichuan province. The results showed that the weather conditions favored the occurrence of tobacco black shank during the growth season of tobacco (from May to July) and the dynamic model of the disease was a singular molecular one, which predictive equation was shown as below: X=1-1.145 e-0.2123 t. The integrated measures of the chemical control by spraying MetalaxylCu 3 times and agricultural management by mainly draining water in the tobacco field could effectively control the disease development. The effect was up to 80%～90%.