双季稻区稻水象甲一代成虫的滞育

对浙江省双季稻区稻水象甲（ＬｉｓｏｒｈｏｐｔｒｕｓｏｒｙｚｏｐｈｉｌｕｓＫｕｓｃｈｅｌ）夏季种群的研究表明，光照和温度可排除在一代成虫夏季滞育的诱导因子之外，而不同的食料条件是引发滞育的主导因素．在自然状态下，即使是强迫滞留，早稻田内的一代成虫也不转入正常发育，但取食稻秧能使新羽一代成虫和稻田内外处于生殖滞育状态的一代成虫的卵巢正常发育，并能解除已进入夏蛰的一代成虫的生殖滞育；同时，不论是新羽成虫还是夏蛰成虫，取食稻秧后卵巢和飞行肌同时发育；若这种食料条件能持续下去，则飞行肌消解而卵巢发育产卵．

Diapause of first generation adults of rice water weevil in double cropping rice area.

Studies on the summer population of rice water weevil ( Lissorhoptrus oryzophilus ) in double cropping rice area of Zhejiang Province indicated that food condition rather than air and soil temperature or day length was the main stimuli of summer diapause of the first generation adults. Under natural conditions, the first generation adults in early rice fields never changed their reproductive diapause status even if they were caged in the paddy. However, if feeding on rice seedlings, first generation adults both newly emerged and in reproductive diapause status would normally develop their ovaries, and the reproductive diapause of the aestivating first generation adults would be over. Meanwhile, the newly emerged and the aestivating adults would develop their ovaries and flight muscles simultaneously. If the food condition was kept, their flight muscles would degenerate and oviposition would be seen.