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在试验室条件下,研究了芜菁夜蛾线虫北京品系与亚洲玉米螟幼虫接触时间,对玉米螟死亡率和死亡速度的影响。结果表明,线虫与玉米螟接触时间在0.5、1、2小时内,玉米螟死亡率随时间的延长而增加,分别为35.3、50.7和61％。4小时以上各处理玉米螟死亡率均达92％以上,差异不明显。线虫与玉米螟接触0.5、8和12小时,其寄主体内进入的线虫数分别为1.2、7.9和23.8～28.3条/虫。玉米螟幼虫的死亡速度也随进人体内线虫数增多而加快,进入一条线虫的寄主在48～96小时内死亡,2～5条线虫的72小时内死亡,6～30条的48小时死亡,31条以上的24小时内死亡。
Under laboratory conditions, the effects of contact time of B. litura Beijing strain and Asian corn borer larvae on the mortality and mortality rate of corn borer were studied. The results showed that when the nematodes and the corn borer were in contact with the corn borer in 0.5, 1, 2 hours, the mortality of corn borer increased with time, 35.3, 50.7 and 61% respectively. The mortality rate of corn borer reached more than 92% in 4 hours or more, the difference was not obvious. The nematodes were exposed to the corn borer for 0.5, 8 and 12 hours. The number of nematodes entering the host was 1.2, 7.9 and 23.8 to 28.3, respectively. The mortality rate of corn borer larvae also accelerated with the number of nematodes entering the body. The host entering a nematode died within 48-96 hours, 2-5 nematodes died within 72 hours and 6-30 died within 48 hours, 31 or more within 24 hours of death.