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 ...