多年的研究与实践证明,为害我国南、北稻区的害虫稻飞虱均是从我国南端和越南等国,每年通过不同稻区,借助气象条件,逐级向北迁飞,而后又逐级回迁南归的。这是我国稻飞虱 Years of research and practice have proved that the pest-weeding planthoppers that cause damage to the southern and northern rice regions of our country are migrating to the north step by step through different rice regions each year from the southern tip of China and Vietnam. Back to the south of the return. This is our planthopper