葡萄树新害虫——光滑足距小蠹的形态特征

采用扫描电镜技术研究成都市农泉驿区危害葡萄的小蠹——光滑足距小蠹Xylosandrus germanus(Blandford)的形态特征。该小蠹具有明显的性二型现象。成虫光亮。雌成虫圆柱形,体长2.02～2.26mm,雄成虫较宽扁,体长1.00～1.30mm。在扫描电镜下,可见成虫前胸前缘的刻点毛均从基部分成两叉,但雌成虫略呈锯齿状,雄成虫呈栉齿状。雌成虫具有贮菌器,位于前胸背板的后端下面。雌成虫鞘翅分为沟中和沟间部,后半部细长毛起自沟间部,雄成虫鞘翅不分沟中和沟间部,后半部部分刻点生有细长毛。

Morphological characteristics of the new pest attacking grapevine,Xylosandrus germanus

Morphological characteristics of Xylosandrus germanus (Blandford),the new pest attacking grapevine, were studied with the aid of scanning electron microscope. The beetle had sexual dimorphism. The adults were shiny. The female adults are cylindrical and about 2.02～2.26 mm in length while the male adults were flat and 1.00～1.30mm. With the aid of scanning electron microscope, the hair in the sculpture of the costal margin of the adult's prothorax was divided into two branches, the female's was serrate while the male's was pectinate. The mycangia of the female adults lay inside the pronotum. The female adults' elytrons could be divided into striae and interstriae, and the hind half of the elytron had long hair only from interstriae. The male adults' elytrons could not be divided into striae and interstriae, and only the hind half of the elytron had some long hair.