Abstract:

Larch bark moth，Cydia zebeana（Lepidoptera：Tortricidae） is an important shoot pest of larch. This paper reported the antennal ultrastructure of sensillum and distribution observed by both scanning and transmission electron microscopes. Eight types of sensillum were found：sensillum trichodea，basiconica，auricillica，styloconica，coeloconica，chaetica，placodea and B hm breistles. Though the sensillum distribution characteristic of different genders was the same，the sensillum types and numbers in male and female showed dimorphism. It is worth to note the sensillum placodea with a tip pore was for the first time reported in lepidopterous moths, which might possess taste sense function.

Key words: Cydia zebeana, antennal sensilla, scanning electron microscopy, transmission electron microscopy, shoot pest