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扣罩观察玉米螟羽化进度法,就是用屋脊形大纱罩扣在玉米螟越冬寄主玉米秸秆堆上,然后逐日检查、记载羽化的雌、雄蛾量,比较消长。检查完的蛾子捏死。这种方法比剖秆检查羽化进度法准确、省工、省事,可提高调查工效1～2倍。它比性信息素诱集法好在能掌握雌雄蛾数量比例,以便研究找出与发生为害关系。比黑光灯诱蛾法好在不需要电源、设备。但要注意扣罩地点应在能代表当地气候特点空旷的环境内;罩下的玉米秸秆数量以能明确地显示出羽化消长规律为度。
Mantle cover corn borer eclosion progress of the method is to use the roof ridge-shaped large yarn cover buckle over the host of corn borer corn stalks heap, and daily inspection, record the emergence of female and male moths, more consumption and growth. Checked moth subjugated. This method is more accurate than the stalks to check the emergence of feathers, labor-saving, save trouble, can improve the efficiency of the survey 1 to 2 times. It is better than the sex pheromone trapping method to master the number of male and female moths in order to find out the relationship with the occurrence of harm. Better than the black light trap method does not require power, equipment. However, it should be noted that the cover location should be able to represent the local climate characteristics of the open environment; under cover the number of corn stalks in order to be able to clearly show the law of emergence and decline of the degree.