稻水象甲(Lissorhoptrus oryzophilus Kuschel)的卵子发生-飞行共轭

１９９４～１９９６年对双季稻区稻水象甲发生消长和迁飞动态的系统研究表明，稻水象甲的飞行肌和卵巢发育随生活史的季节性变化出现兴衰交替，从而迁入迁出稻田和越冬场所，表现出典型的卵子发生－飞行共轭：春季越冬代成虫从越冬场所迁入早稻田后飞行肌消解而卵巢发育，繁殖形成一代致害种群。夏季一代成虫生殖滞育，飞行肌和脂肪体发达，绝大部分个体迁出早稻田行夏蛰并越冬；少量落入秧田者和早稻收割时散落田内而晚稻插秧时尚未迁离的个体卵巢恢复发育，飞行肌消解而构成二代虫源。秋季二代成虫羽化后生殖滞育，迁飞上山越冬；１０月中旬后羽化的个体卵巢和飞行肌均不再发育而滞留田内外越冬。取食高质量食料时，一代夏蛰成虫飞行肌再生，新羽一代成虫则首先发育飞行肌，而后解除生殖滞育。

THE OOGENESIS FLIGHT SYNDROME OF RICE WATER WEEVIL, Lissorhoptrus oryzophilus Kuschel

The seasonal migration and oogenesis flight syndrome of the rice water weevil(RWW), Lissorhoptrus oryzophilus Kuschel,in the double rice cropping area of Zhejiang Province was studied from 1994 to 1996.The flight muscles of RWW undergo cyclic degeneration and regeneration with the seasonal migration to and from aestivo hibernation sites and show an obvious oogenesis flight syndrome.The over wintered adults migrate to the early rice fields in spring to produce a damaging generation.All of the newly emerged adults are in a state of reproductive diapause and possess well developed flight muscles and hypertrophic fat bodies.Most of them fly to dormancy sites with aestival autumn hibernal diapause,only a few individuals,that land to rice seedling fields or still stay in the paddy fields when the late rice transplanting strats,will develop to next generation.The adults emerge in the autumn migrate to hibernation sites.but the weevils emerged since the second half of October will not develop their flight muscles and will stay at the fields or ridges for hibernation.If high quality foods are provided,regeneration of the flight muscles of the aestival weevils will occur,and the newly emerged adults will first develop their flight muscles and then break down their reproductive diapause.