杭州地区草地贪夜蛾田间动态分析与生物型鉴定

Field population dynamics analysis and biotype identification of Spodoptera frugiperda in Hangzhou,China

草地贪夜蛾(Spodoptera frugiperda)自2019年1月入侵我国以来,已在我国多个省份暴发,对农业生产造成巨大威胁。为了解草地贪夜蛾在浙江杭州地区的田间分布及发生规律,采用田间诱捕法,在杭州不同玉米种植区设置性诱监测点,2019—2021年连续3年对草地贪夜蛾成虫进行监测,并通过分子生物学方法对其生物型进行鉴定。结果表明,经分子鉴定杭州地区草地贪夜蛾是玉米型和水稻型杂交种,其取食偏好玉米叶片。连续监测结果显示,2019年下半年杭州地区草地贪夜蛾发生最为严重,单个诱捕器每7 d最多可诱集到388头;2020年和2021年草地贪夜蛾的发生逐年下降,单个诱捕器每7 d最多分别可诱集到174头和29头。

The armyworm Spodoptera frugiperda,which invaded China in January 2019,has been an outbreak in many provinces of China,causing a great impact on food security production.In order to determine the distribution and occurrence regularity of S.frugiperda in the field of Hangzhou,Zhejiang Province,monitoring sites were set up to monitor the population of S.frugiperda in different maize planting areas from 2019 to 2021,and the biotypes of S.frugiperda were identified by molecular biological methods.The results showed that S.frugiperda mainly distributed in Hangzhou area was identified as a hybrid of maize-type and rice-type by molecular identification,and its feeding preference was maize leaves.In 2019,S.frugiperda infestations occurred in many areas in Hangzhou,especially in September to November.The highest number of trapped male moths in a single trap was 388 moths per week.The occurrence of S.frugiperda in Hangzhou decreased significantly in 2020 and 2021.The highest number of trapped male moths in a single trap was 174 moths per week and 29 moths per week respectively.