烟夜蛾及棉铃虫在河南烟区的数量组成及成因分析

Occurrence and quantity ratio of the oriental tobacco budworm Helicoverpa assulta Guenée and the cotton bollworm H. armigera Hübner in tobacco field of Henan

调查结果表明,在豫中南烟区烟田发生的青虫,6,9月份以烟夜蛾为主,7,8月份烟夜蛾和棉铃虫的数量基本持平,降雨量过少的年份,棉铃虫数量有所上升.在这些地区,6,9月份应以防治烟夜蛾为主,7,8月份2种害虫都要兼顾,降雨量偏少的年份,棉铃虫的防治不可忽视.豫西烟区烟田7,8月份均为烟夜蛾占据优势.豫东烟区烟田,6,7,8月份亦均为烟夜蛾为多.在这2个地区,应以烟夜蛾为主要防治对象.

The quantity change of the Oriental Tobacco Budworm (OTB) , Helicoverpa assulta Guenée , and the Cotton Bollworm (CBW) ,H. armigera Hübner , on tobacco in Henan Province were investigated . The results show that, on tobacco of central and south Henan , the number of OTB is larger in June and September and OTB and CBW are roughly equal in amount in July and August. In case annual rainfall is lower , the number of CBW probably increase.Therefore OTB should be mainly controlled in June and September, while both OTB and CBW be controlled in July and August. OTB in July and August in west Henan and from June to August in east Henan are dominant and should be mainly controlled in the both areas.