稻水象甲在浙江双季稻区每年发生２代，以成虫滞育越冬。春季越冬成虫迁入早稻田繁殖，形成１代致害种群；夏季１代成虫生殖滞育，绝大部分个体（９５％以上）迁出早稻田行夏蛰并越冬；秋季２代成虫羽化后，大部分迁飞山上草地越冬。 Rice water weevil occurs in Zhejiang double-cropping rice area for two generations each year, with adult diapause overwintering. The overwintering adults migrated into Waseda to breed in the first spring, and the first generation of adults in the summer produced diapause. Most of the individuals (more than 95%) migrated out of the early summer and were overwintering in the early rice field. After the second generation of adults became subducted in autumn, most of the individuals Move over the mountain grassy winter.