甘、宁、青三省（区）小麦吸浆虫分布区及发生动态分析

The Regional Distrbution and Population Dynamics of Wheat Midge in Gansu ,Ningxia and Qinghai

甘、宁、青三省（区）小麦吸浆虫主要分布区为海东及临夏发生区，陇中半干旱引黄灌区发生区，宁夏引黄灌区发生区，六盘山阴湿山地及塬区发生区和渭水上游及岭南徽成盆地发生区共５个主要发生区。三省（区）小麦吸浆虫的动态发生呈“马鞍形”过程，其主要原因是：小麦品种的更换、作物布局和耕作制度的改变、农田灌溉条件的改善等农业生态条件的变化，加之防治工作滞后等。应针对以上原因，采取相应措施，做好小麦吸浆虫的防治。

There are 5 main regions of wheat midge distribution in Gansu ,Ningxia and Qinghai including the east Qinghai and Linxia ,the semiard irrigation erea by divert- ing water from the Yellow River in middle part of Gausu,the irrigation area by divert- ing water from the Yellow River in Ningxia,and the Liupan mountain and neighboring highland,and the upper reaches of Wei River and Huixian-Chengxian basin. The dy- namic recourence and outbreak of wheat midge appeared to be the “saddle shape”. The main reason of its occurence proces is that changes occur in agroecological conditions such as the replacement of susceptible wheat cultivars,crop patterns and farming sys- tem and improvement in the field irrigation conditions and the delay of pest manage- ment,which can account for the recurrence and outbreak of wheat midge. Based on the above reasons,the corresponding measures should be adopted to prevent the occurence of wheat midge.