松阿扁叶蜂虫龄和虫口密度对油松松针的影响

松阿扁叶蜂是我国林业的主要害虫之一,严重危害油松、樟子松。本试验采用室内饲养法,在实验室从卵开始饲养各个虫态的松阿扁叶蜂幼虫,分析不同虫口密度下各虫龄幼虫对松针的危害状况。试验结果表明,松阿扁叶蜂在3龄前食量较小,3龄和4龄阶段是快速生长期,也是危害油松高峰期。在3龄前进行防治,可以取得较高的防治效果。

Effect of Age and Population Density of Acantholyda Posticalis Matsumura on Pinus Tabuliformis

Acantholyda posticalis Matsumura is one of the main forest pests in China,which is harmful to Pinus tabuliformis and Pinus sylvestris.The larvae of Acantholyda posticalis Matsumura in various insect forms were raised from eggs in the laboratory to analysis the dynamic damage of Pinus tabuliformis by different age under different population density.Results showed that Acantholyda posticalis Matsumura ate less before 3rd instar.It fast growth stage was 3rd instar and 4th instar,and it was also the peak period of harming Pinus tabuliformis.High control efficiency of Acantholyda posticalis Matsumura could be achieved by controlling before 3rd instar.