Long-Distance Migration of Rice Insects

摘要: The Asian rice plant is considered to have originated in the Assam-Yunnan area and a spread during last few thousand years over wide extending from 51° N 35° S latitude at various elevations sea level up 2,000 m. It harbors many insect pests which been disseminated with itself or are endemic location where has introduced. Among former, brown planthopper, Nilaparvata lugens (Stal) white-backed Sogatella furcifera Horvath, both of tropical origin, serious temperate East Asia for several hundred more. In past 20 these planthoppers were found immigrate annually southern areas into Japan (Asahina Tsuruoka 1968; Kisimoto 1976). tropics, however, so-called green revolution, since early 1960s introduced new high-yielding cultivars improved methods cultivation, also induced drastic change pest problems. N. lugens, long minor pest, now appears be major as sapfeeder vector viruses throughout most Asia.