A Simple Method for Identifying Sex of Plutella xylostella(Linnaeus)Larva, Pupa and Adult
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摘要: 在形态观察基础上,结合相关文献,系统描述了小菜蛾幼虫、蛹和成虫的雌雄形态快速识别特征。结果表明,用肉眼和光学显微镜无法区分小菜蛾1龄和2龄幼虫的性别,但可以区分3龄和4龄幼虫的性别,主要特征是雄虫在第5腹节内有睾丸,背面呈浅黄色,与相邻体节形成明显区别。小菜蛾雄蛹第9腹节腹面有1个生殖孔,形成短纵裂缝且两边各有一瘤状突起,而雌蛹第8腹节腹面有1个生殖孔,第9腹节腹面有1个产卵孔,2孔之间连成长纵裂缝。雄蛾翅后缘从翅基到外缘呈三度曲波状的黄褐色带,腹部末端钳状,抱握器微张开;雌蛾体色较雄蛾淡,个体较雄蛾大,腹部末端圆筒形。Abstract: Based on the morphological appearances and descriptions in literature,a simple and convenient method for identifying the sex of diamondback moth(DBM),Plutella xylostella(Linnaeus),was developed.The results showed that the sex of the first-and second-instar larvae was not easily distinguishable by naked eyes or optical microscopic observation.However,the male third-and fourth-instar larva showed a lighter colored fifth abdominal segment than that on the female counterparts.On the male pupae,a lump on each side of a short,longitudinal slip was visible near the gonopore on the 9th abdominal segment.The female pupae had a long,longitudinal slip between the genital pore on the 8th abdominal segment and the oviporus on the 9th segment.The adult males had characteristic brown wings with a wavy edge on the posterior margin and a yorked abdominal end.The female adults,on the other hand,were lighter in color and bigger on body size than the males,and had their abdominal ends appeared round in shape.
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Keywords:
- Plutella xylostella /
- larvae /
- pupae /
- abdomen /
- gonopore
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TALEKAR N S, SHELTON A M.Biology, ecology,a nd management of the diamondback moth[J].Annual Review of Entomology,1993, 38: 275-301.
王香萍,方宇凌,张钟宁. 小菜蛾对合成植物挥发物的活性反应[J]. 昆虫学报, 2005, 48(4):503-508. CHEN X D, NAKASUJI F.Diminished egg size in fenvalerate resistant strains of the diamondback moth Plutella xylostella(Lepidoptera : Yponomeutidae)[J].Applied Entomology and Zoology,2004, 39: 335-341.
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