紫苜蓿叶象甲寄生蜂种群数量消长初步研究  

Preliminary analysis of population dynamics of the parasitic natural enemies of the alfalfa weevil,Hypera postica

作　　者：朱晓锋[1] 赵莉[1] 

机构地区：[1]新疆农业大学农学院,新疆草地资源与生态实验室,乌鲁木齐830052

出　　处：《植物保护》2008年第4期50-53,共4页Plant Protection

基　　金：新疆维吾尔自治区科技攻关和重点项目(200231107);新疆现代化畜牧业试验示范项目办资助

摘　　要：以呼图壁种牛场苜蓿生产基地为主要观测点对紫苜蓿叶象甲幼虫、寄生性天敌消长规律以及幼虫寄生率的调查分析表明：在苜蓿生长期紫苜蓿叶象甲及苜蓿叶象啮小蜂共出现3个高峰期；春季紫苜蓿叶象甲发生初期，越冬代苜蓿叶象啮小蜂大量出现，夏秋2季随寄主数量的增加而增加；确定紫苜蓿叶象甲的优势寄生蜂为苜蓿叶象啮小蜂[Tetrastichus incertus（Ratzeburg）]；寄生性天敌对苜蓿叶象甲幼虫起着重要的控制作用，寄生率在5．10％～78．95％之间，年平均为30．55％。The population dynamics of the larvae of the alfalfa weevil Hypera postica（Gyllenhal） and their parasitic natural enemies and parasitism rates of the alfalfa weevil larvae were analyzed. The results showed that three population peaks of Tetrastichus incertus and the alfalfa weevil occurred in alfalfa fields during the whole growth stage of alfalfa. In spring, the population of T. incertus was large at the initial stage of emergency of the alfalfa larvae, increasing with the increase of their host in summer and fall. The dominant parasitoid of alfalfa weevil was T. incertus. The parasitic natural enemies play an important role in controlling the alfalfa weevil. The parasitic rates to alfalfa weevil larvae range from 5.10% to 78.95%, with an average rate of 30.55 %.

关 键 词：苜蓿叶象甲 寄生性天敌 苜蓿叶象啮小蜂 种群消长 

分 类 号：S435.4[农业科学—农业昆虫与害虫防治]