摘要
大袋蛾是多种林木及茶、果的重要害虫。一年发生1代,以老熟幼虫越冬。常有不完全第2代发生。雌蛾平均每头产卵2623粒。由于雌蛾无翅,主要靠幼龄幼虫吐丝随风扬迁扩散,但在茶树等灌丛、矮树上飘迁有限,形成“为害中心”;在乔木上,则扬迁扩散迅速,易于大片发生。幼虫食叶量大,4、5龄幼虫暴食,8—9月间为害严重。幼虫较耐干旱,相对湿度40％时,孵化率仍达90％以上。食性杂,但不同树种间虫口差异明显。幼龄幼虫期受雨水冲刷和瓢虫等捕食,成长幼虫被寄蝇寄生、病害感染和鸟类啄食,综合构成大袋蛾的有力的自然控制因素。幼虫喜光,多聚于枝梢上部,利于果树修剪减少虫口。药剂防治宜于幼龄幼虫期进行,并适当重喷喷湿袋囊,敌百虫、敌敌畏、1605均有良好防治效果。
The bigger bagworm, Clania varigata Cram (Lepidoptera; Psychidae),is a pest seriously harmful to tea plant, certain fruits and many trees. Aseries of experiments were conducted to ascertain its life history, biologicalpeculiarity, development and relation to environment. The results reveal: Bigger bagworm multiplies once a year. The old larvae over winterwithin their' bags'. On average, a femal moth lays 2623 eggs. Femalemoths are wingless, and the bagworms spread mainly by young inster larval.The larvae are tolerant to drought, and in a low humidity (RH=40% ) itshatching Percentage is up to 90. Effective control measures include: a) biological control: There are many natural enemies durine larvalstage, such as parasitic flies, viruses and certain birds. They can power-fully suppress larval populations of this pests. We must protect and utilizethem to control bigger bagworm. b) chemical control: Some insecticides such as Dipterex, DDVP orParathion at can be applied against young larvae. c) tree pruning: The bagworm laryal are phototactic and prefer to livetogether on tree top. So frequent trimming of tea plants and fruit treesat proper time helps population decline.
关键词
大袋蛾
发生规律
防治
Bigger bagworm
Development
Control
