8月中旬以来,我国玉米主产区大部玉米进入生长发育和产量形成的关键时期,中后期病虫害也相继进入发生为害高峰期。各地病虫发生种类多、发生范围广、为害程度上升快,以玉米大(小)斑病、褐斑病等病害发生为害最为突出,玉米叶螨和玉米双斑萤叶甲等喜旱性虫害在部分地区为害严重,玉米螟发生为害相对平稳。总体看,玉米虫害发生面积大于病害,但病害为害程度重于虫害。 Since the middle of August, most of the main maize producing areas in China have entered the critical period of growth, development and yield formation. In the late mid and late pests and diseases have also entered into the peak period of damage. Occurrence of pests and diseases around a wide range of occurrence of a wide range of damage increased rapidly to maize (small) spot disease, brown spot disease and other diseases are most prominent, corn spider mites and corn biflora Diabrotica and other drought-tolerant pests Severe damage in some areas, the occurrence of corn borer is relatively stable. Overall, corn pests occurred larger than the disease area, but the degree of disease damage is more important than pests.