河北省不同地理区域的棉铃虫种群分布

Population Distribution of Helicoverpa armigera in Different Geographical Regions of Hebei Province

随着黄河流域棉花种植面积的逐渐缩小,Bt棉花作为棉铃虫“诱杀陷阱”的作用逐渐减弱。为了明确河北省各作物种植结构调整后棉铃虫在不同地理区域内的种群分布特点,2018年和2019年利用性信息素诱捕技术,监测了5—9月河北省从南到北不同作物上棉铃虫成虫的种群数量。结果表明:(1)河北省棉铃虫种群发生数量大,并在多种寄主作物田中广泛分布,其中冀南地区棉田棉铃虫有4个成虫发生高峰期,高峰期诱捕虫量均达到100头/个(诱捕器)以上,最高达到了272.67头/个(诱捕器);(2)棉铃虫种群数量从南到北呈逐步递减趋势,南部、中部、北部的最高诱捕虫量分别为272.67、118.00和94.50头/个(诱捕器);(3)除棉田外,花生和玉米等作物田以及葡萄等果园的棉铃虫也需要引起足够重视。本研究结果明确了河北省新的种植结构布局下不同地理区域内棉铃虫的种群数量及其分布动态,可为华北地区不同作物布局下棉铃虫的区域性防治提供理论依据。

With the gradual reduction of cotton planting area in the Yellow River basin,the role of Bt cotton as a‘trap’for Helicoverpa armigera is gradually weaked.In order to clarify the population distribution characteristics of H.armigera in Hebei Province after adjusting the planting structure of various crops in different geographical regions,the number of adult H.armigera on a variety of crops from south to north of Hebei was monitored by using the sex pheromone trapping technique from May to September in 2018-2019.The results showed that:(1)there were large population of H.armigera in Hebei,and they were widely distributed in various host crop fields.There were four peaks of adult H.armigera in cotton field in southern Hebei,and the number of adult H.armigera was more than 100 per trap in the peak,and the highest was 272.67 per trap.(2)The population number of H.armigera decreased gradually from south to north,and the highest population were 272.67,118.00 and 94.50 per trap,respectively.(3)In addition to cotton field,H.armigera should also be paid more attention to in peanut,corn and grape orchards.The results of this study clarified the population quantity and dynamic distribution of H.armigera in different geographical regions under the new planting structure in Hebei Province,which can provide theoretical basis for regional control of H.armigera under different crop layout in North China.