论文部分内容阅读
一、发生为害特点稻飞虱在南方稻区部分省市原为早、中稻的主要害虫,但近年来发展到大面积为害晚稻,特别自1968年以来,不但南方稻区各省市均普遍严重发生,部分地区造成的损失甚至超过螟虫,同时在北方稻区如河南、河北、山西、陕西、辽宁、吉林、北京等省市亦普遍严重暴发。根据近几年来的发生发展看来,稻飞虱已成为全国性稻区的大害虫。稻叶蝉在南方稻区大部分省市发生为害面大,特别是由黑尾叶蝉传染而引起的普通矮缩病、黄矮病的流行,有逐年扩大的趋势。根据各省、市现有资料,我国为害水稻的稻飞虱有褐稻虱、白背稻虱、灰稻虱、稗稻虱、长稻虱、黑头菱稻虱、白脊稻虱等七种。其中以前三种为害水稻最严重。南方稻区广
First, the occurrence of pest characteristics of rice planthoppers in southern rice provinces in some provinces and cities as early, middle peasants of the main pests, but in late years to develop large-scale damage to late rice, especially since 1968, not only in southern rice provinces and municipalities are generally serious, In some areas, the losses were even more than stem borers. In the meantime, outbreaks were widespread in the northern rice areas such as Henan, Hebei, Shanxi, Shaanxi, Liaoning, Jilin and Beijing. According to occurrence and development in recent years, planthopper has become a large pest in the national rice area. Inferior rice leafhoppers occurred in most provinces and cities in the southern rice area, especially the common dwarf disease and yellow dwarf disease caused by the infection of the black leafhopper, which has been expanding year by year. According to the available information of provinces and cities, there are seven species of rice planthopper that infest rice in our country, such as brown planthopper, white back planthopper, gray flies, barnyard grasshopper, long lice, black head louse, white spider louse. One of the three most serious damage to rice. Southern rice area wide