七十年代中期,烟草蛀茎蛾Gnortmo-schema heliopa Loew因从邻县大量调运烤烟苗而传入息烽县,至今遍及各区、社,成为息烽县烟草上难以防治的重要害虫。烟草苗期受害率一般为5～10％,严重地块高达40％以上。在重灾区烟草后期受害率高达80～100％。现将本县范围内初步调查的结果整理如下。 In the mid-1970s, Gnortmo-schema heliopa Loew was introduced into Xifeng County due to a large number of tobacco plants from neighboring counties. It has spread throughout the districts and communes so far and has become an unmanageable pest of tobacco in Xifeng County. Tobacco seedling damage rate is generally 5 to 10%, a serious block up to 40% or more. In the hardest hit area, the damage rate of late tobacco is up to 80 ~ 100%. Now the results of the initial investigation within the scope of this county are organized as follows.