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2002～2008年烟草角斑病与气象因素关系分析结果表明,6月份降雨量和雨日数与采收末期烟草角斑病病情指数关系较为密切,可作为病情预测的主要因子。品种龙江911较品种NC89更易感病;玉米茬种植烟草较烟草前茬烟株发病率和病情指数极显著偏高;接种条件下,中部叶与上部叶病情指数差异不显著,但中部叶和上部叶病情指数均显著高于下部叶;上部叶经济损失与病情指数之间存在着极显著直线回归关系,病情指数每增加1,单株上部叶经济损失增加0.004 9元;按目前的防治成本,达到经济损害时的病情指数为5.2。
Analysis of the relationship between tobacco leaf spot and meteorological factors from 2002 to 2008 showed that the relationship between precipitation and rainy days in June was closely related to the disease index of tobacco leaf spot in the end of harvest, which could be used as the main factor of disease prediction. The varieties of Longjiang 911 were more susceptible than the varieties of NC89; the incidence and the disease index of tobacco plants grown on corn stubble were significantly higher than those of tobacco stubble tobacco varieties. Under the conditions of inoculation, there was no significant difference in disease index between middle lobe and upper lobe, The index of upper leaf disease was significantly higher than that of the lower leaf. There was a significant linear regression between the economic loss of the upper leaf and the index of disease. Each increase of the disease index increased the economic loss of the upper leaf by 0.004 9 yuan. According to the current prevention and control cost , When the economic damage to the disease index was 5.2.