鄂西北烟区斜纹夜蛾发生动态研究

Occurrence Dynamics of Spodoptera litura in Northwest Hubei Tobacco Region

为了了解斜纹夜蛾在鄂西北烟草种植区的危害情况,选择在襄阳保康烟区通过系统定点、不同海拔定点观测,了解斜纹夜蛾在烟田的发生动态规律。结果表明,2017年烟田斜纹夜蛾初发期在5月10日,5月18日出现第1个发生高峰期,6月中旬出现第2个高峰期,在此期间发生量较低;7月出现第3个高峰期,8月中下旬为持续发生期。在海拔850、1050、1150m斜纹夜蛾的发生规律基本相同,发生量随海拔的升高而增加。该研究为实时防治烟田斜纹夜蛾成虫和测报虫害提供理论依据。

In order to understand the rules of Spodoptera litura adult dynamic change in tobacco planting field at Northwest, Hubei Province,the amount of Spodoptera litura adults were systematic investigated at some test plots in tobacco-growing area of Baokang, Xiangyang City.The result showed that in 2017, the first occurrence S. lituraadult in tobacco fields was May 10.The amounts of adults trapped came to apeak on 18 May and another peak was occurred in mid-June.And the third peak occurred throngh July 5 to mid-late August.But there was less amounts of adults can be trapped in other time relatively. The amounts of adults trapped had no significant difference at different altitudes (850,1 050 and 1 150 m above sea level). These results provided a theory evidence to precast and control S.litura adults.