盩厔县南依秦岭,北临渭河、地势此較复杂,无霜期220天左右,年雨量平均787毫米,全年平均气温14.4℃。由于盩厔山大水多,气候湿潤、杂草丛生,因之适宜各种病虫害的繁殖和蔓延。全县共有稻田156,000亩,其中稻麦兩熟田約28,000亩,均有不同严重程度的遭受稻飞虱的为害。特別是麦收后的囘槎水稻,受害較为严重 Xuyi County, according to Qinling Ridge in the south, Weihe River in the north, the more complex terrain, frost-free period of about 220 days, the average annual rainfall of 787 mm, the annual average temperature of 14.4 ℃. Due to the vast water of Mount Qionglai, humid climate, overgrown with weeds, it is suitable for breeding and spread of various pests. The county has a total of 156,000 acres of paddy fields, of which about 28,000 acres of rice and wheat fields, both have different degrees of severity of planthopper damage. In particular, after the harvest of wheat harvest 槎 rice, the more serious victims