一、试验目的我县应用省林科所筛选的激光诱变的白僵菌4号、35号、38号等几个菌株(以下简称粤林激光4号……),试验生产出不同的粉剂,并在长山公社良文堂大队林场于1975年5月21日至6月13日做林间试验比较,选取对松毛虫毒杀力强菌种用于生产。二、试验材料及方法不同菌株白僵菌粉剂的孢子含量同为50亿/克,细度在60目以下,水份含量5%以下, First, the purpose of the trial I County Forestry Department selected by laser-induced Beauveria bassiana No. 4, No. 35, No. 38 and several strains (hereinafter referred to as Yulin Lin No. 4), the trial produced a different powder , And in the Changshan commune Liangwen Tang brigade farm in May 21, 1975 to June 13 to do the forest test comparison, selection of strong detoxification strains of Dendrolimus for production. Second, the test materials and methods Different strains of Beauveria bassiana powder spores content of 5 billion / g, the fineness of 60 mesh below the moisture content of 5% or less,