梨小食心虫幼虫感受器扫描电镜观察

梨小食心虫Grapholita molesta(Busck)是一种世界性蛀果害虫,主要以幼虫钻蛀蔷薇科果树的嫩梢和果实进行为害.本文利用扫描电子显微镜观察了梨小食心虫幼虫的超微形态和感受器.结果表明,幼虫触角上有3种类型的感受器:2个刺形感受器、6个锥形感受器和1个栓锥形感受器.上唇有6对刺形感受器.上颚的前端有切齿叶.在下颚的轴节和茎节各有1个刺形感受器.每个外颚叶有3个短而尖的锥形感受器、2个大的栓锥形感受器和3个刺形感受器.体节末梢的下颚须有7个锥形感受器、1个栓锥形感受器.下颚须的末端有1个指形感受器和2个板形感受器.每个下唇须末端具有1个尖锥状刺形感受器和1个长的栓锥形感受器.胸足与腹足上也分布有不规则的毛型感受器和刺型感受器.该研究将为进一步阐明梨小食心虫与其寄主的关系提供形态学的理论基础.

Sensilla of larval Grapholita molesta ( Busck) ( Lepidoptera: Tortricidae) using scanning electron microscopy

The oriental fruit moths(OFM), Grapholita molesta(Busck) is one of the important fruit-boring pests in the world. Shoots and fruits of Rosaceae fruit trees are fed by the larval OFM. In this paper, the ultrastructural morphology and receptors of larval OFM were observed by scanning electron microscope(SEM). Our results showed the antennae had three types of sensilla, including two sensilla chaetica, six sensilla basiconica, and a sensillun styloconicum. The labrum had six pairs of sensilla chaetica. The apex of each mandible was dentate and had five teeth. For the maxilla, both cardo and stipes had a sensillum chaeticum. Each galea had three short-sharp sensilla basiconica, two big sensilla styloconica and three sensilla chaetica. The maxillary palp had seven sensilla basiconica, a sensillun styloconicum, distally a sensillum digitiformium and two sensillum placodeum. Each labial palp had laterally a cone-shaped sensillum chaeticum and a long sensillum styloconicum. There were also irregular hair type and thorn type receptors on thoracic legs and prolegs of the body. Therefore, these might provide a theoretical basis for further exploring the relationship between the OFM larvae and its hosts.