这些作物经长期的人工栽培和少数基因型品种的大面积推广，使这些农作物遗传资源越来越狭窄，受病虫和非生物逆境的危害越来越严重。
These crops have been cultivated for a long time and only few cultivated varieties have spreaded to great area. The genetic resources of these crops has become more and more limited.
通过示范应用YW-3NB型纳米灯诱杀器，对大面积推广应用物理防治法控制甜菜夜蛾的危害以及完善有害生物综合防治技术进行了探讨。
The application of YW-3NB nanometre lamp to trap and kill the beet armywoum were studied, and its future extension as one of physical control method in IPM were discussed.
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