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随着种植业内部结构的调整,北方农田种植红麻日趋扩展。例如我县在1984在以前年种红麻不足1,000亩,而1985年却一次性播种春、夏红麻116,000亩,占全县农作物面积的10.3%,红麻面积的成百倍增长,使农业生态系环境改变,致使原来为害粮、棉等作物的杂食性害虫如玉米螟、棉小造桥虫、棉大卷叶螟、绿盲蝽以及豆蚜、红蜘蛛等害虫相继迁移、转主为害红麻,尤以一代玉米螟,二代棉小造桥虫发生更为猖獗。根据1985年调查,春麻一代玉米螟为害率6—13.6%,平均7.4%。
With the adjustment of the internal structure of the planting industry, the cultivation of kenaf in the northern farmland is expanding day by day. For example, my county in 1984 in the previous year kenaf less than 1,000 acres, but in 1985 was a one-time sowing spring and summer kenaf 116,000 acres, accounting for 10.3% of the county’s crop area, Kenaf area hundreds of times the growth of agro-ecological Department of environmental changes, resulting in the original damage to food, cotton and other crops omnivorous pests such as corn borer, cotton, cotton leaf roller, cotton leaf roller, green bug and spider mite, spider mite and other insects have one after another to transfer the main red Ma, especially in a generation of corn borer, second generation cotton bridge disease occurred more rampant. According to the 1985 survey, the maize borer boreal damage rate was 6-13.6%, with an average of 7.4%.