镇远县烟青虫的发生规律

Occurrence Regulation of Heliothis assultain Zhenyuan County

为镇远烟区烟青虫的预测测报及综合防治提供参考,通过性诱剂诱捕法和田间棋盘式5点取样调查法,对烟区烟青虫发生规律和寄生茧蜂发生量进行田间调查。结果表明:镇远县烟区烟青虫的发生呈双峰型,2个峰分别出现在5月下旬和6月下旬;烟青虫的始发期为5月上旬,危害以5月中旬至6月下旬最重。寄生茧蜂始现期为5月上、中旬,高峰期在6月上旬,之后虫口数随着时间的推移逐渐下降。镇远县烟区烟青虫防治最佳时期为5月上旬至7月上旬。

In order to provide references for forecast and prediction,comprehensive prevention and control of Heliothis assulta in Zhenyuan tobacco planting area,gyplure trap method and field chessboard type sampling method were employed to conduct the field investigation of H.assulta occurrence regulation and parasitic aphidiidae occurrence quantity.Results:H.assulta occurrence in Zhenyuan tobacco planting area presents a double-peak curve,respectively appears in last ten days of May and June;The initial occurrence period of H.assulta is first ten days of May,and the damage is extremely severe from middle ten days of May to last ten days of June.The initial occurrence period of parasitic aphidiidae is the first and middle ten days of May,and the peak stage appears in the first ten days of June.Then the population number gradually decreas with time.So the best prevention and control period of H.assulta in Zhenyuan tobacco planting area is from first ten days of May to first ten days of July.