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栎黄枯叶蛾幼虫龄数的确定

Chinese Journal of Applied Entomology(2014)

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Abstract
[目的]为明确栎黄枯叶蛾Trabala vishnou gigantina Yang幼虫的发育状况,以便进行预测预报及采取防治措施.[方法]通过野外采样获取不同发育状态的栎黄枯叶蛾幼虫,对其头壳宽度,体长,体宽,额宽,上颚基部宽和单眼间距6项形态指标进行测量,利用Crosby生长法则和线性回归方法,推断栎黄枯叶蛾幼虫的龄数.[结果]栎黄枯叶蛾幼虫有7龄,头壳宽度为最佳分龄结构.单眼间距、额宽和上颚宽3项指标均可作为分龄的辅助手段,体长和体宽变异较大,不宜用作幼虫龄数划分.[结论]研究结果为生产上合理防治该害虫提供了参考依据.
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Key words
Trabala vishnou gigantina,larva,morphological characters,instar number,Crosby index,Brooks index
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