１小麦病虫发生的新变化河北省暨华北地区是我国小麦主产区之一。随着种植业结构的调整和种植技术的提高，加上气候变暖，麦田病虫害发生了很大的变化，呈现一些新特点：一是对小麦产量影响较大的小麦条锈病、黑穗病、丛矮病、线虫病、地下害虫等主要病虫害发生程度和发生范围 1 New Changes in the Occurrence of Wheat Pests Hebei and North China are one of the major wheat producing areas in China. With the adjustment of planting structure and the improvement of planting techniques, coupled with the warming of the climate, pests and diseases in wheat fields have undergone great changes, showing some new features: First, wheat stripe rust, smut, Dwarf disease, nematode disease, underground pests and other major pests and diseases occurrence and extent