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应用不同囊皮厚度的绿色威雷Ⅰ号和Ⅱ号对红脂大小蠹进行室内毒力测定 ,选出致死率较高的浓度为 2 5倍稀释液 ,用该浓度药液通过野外网虫试验 ,第 15天接虫死亡率可达 80 %以上。在有效期内其林间防治效果良好 ,虫孔减退率分别达 10 0 %和 94 2 %。
Applying the different thickness of greenhouses, Weilai I and II to the indoor toxicity test, we chose the 25 times dilution with the higher lethality rate. Through the field test, The mortality rate on the 15th day can reach more than 80%. In the period of validity, the effect of forest control was good. The rate of worm hole reduction was 100% and 94 2% respectively.