玉米心叶培养白僵菌防治玉米螟的研究

AN INVESTIGATION OF CULTURING THE FUNGOUS PATHOGEN,BEAUVERIA BASSIANA IN MAIZE WHORL AGAINST CORN BORER (OSTRINIA FURNACALIS)

玉米心叶中具有白僵菌生长的适宜温、湿度条件,利用少量培养料加以沙子(或炉灰渣)等作填充料便可使白僵菌得以繁殖,同时防治了玉米螟。调查表明:在玉米心叶中培养白僵菌可增殖6—8倍,治螟效果达68.4—94.5％(平均为86.2％),相当于田间撒颗粒剂。可比田间撒颗粒剂提前施用期7—10天。由于此时玉米植株矮小,便于投药。玉米心叶培养白僵菌可以大大简化生产流程,取消了室内三级培养工序,减少了杂菌污染,节省人力、物力,降低生产成本。同时做到繁治结合,各户农民可以自繁自用,繁而易行,是当前治螟工作上一项新方法。

There are suitable temperature and humidity in maize whorl for cultivation of the fungous pathogen, BEAUVERIA BASSIANA. Small quantity of cultural material with sand as fillin can be got good mul tiplication of B.BASSIANA and control of corn borer. The results have indicated that multiplication rate of B.BASSIANA in maize whorl is about 6—8 times in culturing than before and efficacy to control corn borer is about 68.4—94.5％ (86.2％ in average), which is equal to granular preparation applied in field, but the time of application is 7—10 days carlier than the latter. The method of culturing B. BASSIANA in maize whorl could simplify working process, save labours,avoid contamintation and decrease the cost of production. Every farmer could easily manage and use it themselves, making combination with multiplication of fungous pathogen and controlling of corn borer in same steps. The author recommended that this method be worth of popularizing in practice.