我区近年来粮食作物病虫害出现了许多新的变化,除常发生一些种类外,过去不成灾的现象正逐年加重,过去已被控制的种类又回升成灾,使生产连年遭受损失,防治处于被动状态。鉴于这一情况,宁夏植保学会于1988年10月27～29日召集了宁夏农学院、宁夏农林科学院、宁夏农校、区农技推广总 In recent years, there have been many new changes in crop diseases and insect pests in our region. Except for some types of occurrence, past unimportant phenomena are increasing year by year. In the past, the species under control have risen again and again and the production has suffered losses year after year. Passive state. In view of this situation, Ningxia Plant Protection Society convened Ningxia Agricultural College, Ningxia Academy of Agriculture and Forestry, Ningxia Agricultural School, District Agricultural Technology Promotion General Office on October 27-29, 1988