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1982年,新疆棉田中棉铃虫和棉叶螨(原称红蜘蛛)大发生(北疆尤为严重),但实际上不同地区、不同单位害虫发生情况差异很大。一般来说,凡用药较多的地区和单位,害虫发生重,反之就轻。很明显,这与各地区各单位是否滥用农药有关。农田里有害虫,也有控制这种害虫的天敌,它们互相制约,处于相对稳定的动态平衡之中。如果用药不当,杀伤了天敌,平衡被破坏,害虫就有大发生的可能。因此,保护利用天敌控制作物害虫是十分重要的。
In 1982, cotton bollworm and cotton spider mite (formerly known as spider mite) occurred in cotton fields in Xinjiang (especially in northern Xinjiang), but in fact, the occurrence of pests in different units varies greatly. In general, where there is more medication in the area and units, pests occur heavier and vice versa. Obviously, it is related to the abuse of pesticides by various localities and units. There are pests in the farmland, and natural enemies that control the pests. They restrict each other and are in a relatively stable dynamic equilibrium. If improper medication, killing natural enemies, the balance is destroyed, the pest there is a big possibility. Therefore, it is very important to protect the crop pests by using natural enemies.