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玉米是我国主要的粮食作物之一,也是河北省最主要的秋粮作物,每年种植面积4500万亩,其中夏玉米种植占78%,达到3500万亩以上。近年来,随着农业种植面积与结构的不断调整,我省的玉米种植面积进一步扩大,但年度间产量不稳定。造成玉米产量不稳定的原因除了品种的不同,栽培技术不一等因素以外,玉米的病虫害得不到很好的防治是其产量不稳定的关键因素。这两年影响玉米产量的主要病虫害都集中发
Corn is one of the main grain crops in China and also the most important autumn crop in Hebei Province. The annual planting area is 45 million mu, of which summer maize planting accounts for 78% and reaches more than 35 million mu. In recent years, with the continuous adjustment of the area and structure of agricultural cultivation, the corn acreage in our province has been further expanded, but the annual output is not stable. The reasons for the instability of corn yield are the key factors that cause unstable output of corn, except that the varieties are different and the cultivation techniques are not the same. The main pests and diseases affecting corn production in these two years are concentrated