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利用白僵菌防治松毛虫,目前在我省已基本普遍应用,群众反映应用白僵菌治虫原料丰富,制造简单,施用方便,花工少,成本低,效果好。但在应用过程中也存在一些问题,往往是虫子治死了,针叶也吃光了,即有“虫子死光一片白,树上松针一片光”的现象,这对树木生长仍有很大影响。为了提高白僵菌的防治效果,确保松林不受损失或少受损失,我们作了冬季放菌,使幼虫早发病,多发病,既提高杀虫效果,又能更好的保护森林资源。现就1973年11月至1974年5月进行的冬春季施放白僵菌的试验简述如下:
The use of Beauveria bassiana prevention and control of pine caterpillars, at present in our province has basically universal application, the masses reflect the application of Beauveria burgdorferi raw materials rich, easy to manufacture, easy to use, less labor, low cost, good effect. However, there are some problems in the process of application. Often the insects die and the needles are also eaten. That is, there is a phenomenon that “a dead insect is white and a pine needle is a light.” This still has a great effect on the growth of trees influences. In order to improve the control effect of Beauveria bassiana and to ensure that the pine forest is not damaged or less damaged, we made winter bacteriosis so as to make the larvae develop early and frequently, which not only improves insecticidal effect but also better protects the forest resources. The tests on the application of Beauveria bassiana in winter and spring from November 1973 to May 1974 are summarized as follows: