中文摘要：

【目的】掌握区域小菜蛾Plutella xylostella（L.）田间种群发生消长规律及温度、降雨和种植制度模式对种群的影响。【方法】2009—2014年,采用性诱剂监测和田间系统调查方法连续6年对滇中菜区——通海县小菜蛾田间种群数量开展成虫和幼虫田间种群数量的研究,分析当地月平均气温、月降雨量和种植模式因素对小菜蛾种群数量的相关性。【结果】（1）通海小菜蛾成虫种群消长年度间波动差异明显,全年呈现1个大的虫峰期为2—11月份,年度间出现小的2-3个虫峰。2012年种群数量较高,高峰期提前到4月份,与2013年高峰期的7—8月份差异明显,2010年和2011年田间种群数量是历年较少年份,种群高峰期的虫量少于百头/盆（卡）/月;（2）小菜蛾幼虫种群全年有2-3个危害峰期,3—6月是发生主峰期,9—11月是弱峰期;与成虫高峰期比较,幼虫田间种群,高峰期推迟20-30 d左右,全年的波动消长情况基本一致;（3）小菜蛾成虫与温度显著相关r=0.442,与降雨量成正相关r=0.283,但相关程度弱;幼虫种群与温度显著相关r=0.530,相关程度显著,与降雨没有相关性r=0.125,相关程度微弱;幼虫种群与成虫有相关性r=0.253,但相关程度微弱。【结论】滇中菜区常年成片种植十字花科蔬菜,一年4造、周年复种的种植制度对小菜蛾的种群发生有促进作用,区域模式相对稳定是造成小菜蛾种群周年活动频繁危害严重的主要原因之一。

英文摘要：

[Objectives] To understand the regional occurrence of the diamondback moth and the effects of temperature, rainfall patterns and cropping planting systems on the population dynamics of this species in Tonghai County, Yunnan. [Methods] Field surveys were conducted for five consecutive years between 2009 and 2014, using sex pheromone monitoring and other survey methods to quantify adult, and larval, populations dynamics, and the effects of monthly mean temperature, monthly rainfall and cropping patterns on the abundance of adults and larvae were analyzed. [Results]（1） The adult population fluctuated significantly between 2009 and 2014. A single, major peak of abundance occurred from February to November in all years, although some years also had 2-3 small population peaks. The highest abundance was recorded in 2012, in which the onset of the peak period advanced to April, and which was significantly higher than abundance recorded in July-August 2013. Population sizes in 2010 and 2011 were relatively small, 100/pot（card）/month;（2） Larvae were present in every month of the year in all years, each of which had 2-3 peak periods of larval abundance with April to June being the main peak period with a smaller peak from September to November. The larval population peak occurred 20-30 days after the peak in adult abundance, but fluctuations in the adult and larval populations were basically the same throughout the year;（3） The size of the adult population was significantly correlated with both temperature（r = 0.442）, and rainfall,（r = 0.283）, but the degree of correlation was weak. Larval abundance was significantly correlated with temperature（r = 0.530）, but not rainfall（r = 0.125）. Larval and adult abundance were positively correlated with each other（r = 0.253）, but the strength of correlation was weak. [Conclusion] The year-round planting of cruciferous vegetables promotes high diamondback moth numbers and consequently increased crop damage. This regional planting pattern is one of th