2009年我国小菜蛾迁飞路径典型案例分析

Typical migration pathways analysis of the diamondback moth Plutella xylostella in China in 2009

小菜蛾Plutella xylostella Linnaeus是一种世界性的十字花科蔬菜重要害虫,具有远距离迁飞的特性,明确小菜蛾在我国的种群发生动态及迁飞路径对其早期预警具有重要意义。本文调查了2009年5月我国南京、故城、安阳、大连、公主岭、沈阳6个地区小菜蛾成虫种群的发生动态,并首次利用HYSPLIT平台对不同地区小菜蛾种群的迁飞峰次进行了轨迹分析。结果表明,2009年5月我国6个地区的小菜蛾成虫种群存在显著地"突增"或"突减"现象,符合迁飞昆虫在迁飞期的种群动态的典型特征;5月14日南京地区起飞的小菜蛾种群可迁飞至大连,5月19日故城地区起飞的小菜蛾种群可迁飞至公主岭,5月20日安阳地区起飞的小菜蛾种群可迁飞至沈阳;首次明确了小菜蛾轨迹分析的设定参数,800-1200 m为小菜蛾适宜迁飞的飞行高度,飞行持续时间一般为2-3 d。

Diamondback moth（DBM） Plutella xylostella（Lepidoptera：Plutellidae） is one of the destructive cruciferous plants and important migration pests. It is important to monitor and warn the pest for elucidate the occurrence dynamics and migration pathways of DBM in different places. The dynamics of DBM occurred in Nanjin,Gucheng,Anyang,Dalian,Gongzhuling,Shenyang in spring of 2009 were studied by the field system survey method,the immigration and emigration peak in different places were determined,and the migration pathway was simulated by using the HYSPLIT. Results showed,in different southern regions of our country in spring of 2009,the adult populations of DBM existed the sudden increase and then decrease phenomenon,which was accordance with the population dynamic characteristics of insect migration during the migratory period. The track analyses of the airflow were suggested the adults of DBM migrated from Nanjing to Dalian on May 14 th,from Gucheng to Gongzhuling on May 19 thand from Anyang toShenyang on May 20 th,respectively. Migration height of DBM is 800-1000 m,and flight duration is 2-3 d.