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室内测定了 2 8、2 1、16和 11℃下球孢白僵菌对桃蚜成蚜的毒力。运用时间 -剂量 -死亡率模型分析了各温度下白僵菌对桃蚜的毒力。结果表明 ,2 8和 2 1℃下 ,桃蚜开始死亡的时间较早 ,而且很快达到较高死亡率。如在 10 7孢子 / ml浓度下 ,桃蚜接菌后 3～ 4天开始死亡 ,第 6天死亡率达 10 0 %。在 2 1℃下 ,白僵菌对桃蚜的致死力比 2 8℃下更强。用同样浓度处理 ,在 16和 11℃下 ,桃蚜分别在接菌后第 6天和第 11天开始死亡 ,第 10天和第 2 0天以后死亡率才达90 %以上。用 10 6孢子 / ml浓度的孢子液处理 ,在 2 8、2 1、16和 11℃下 ,白僵菌对桃蚜的 L T5 0 值分别为 5 .1、3.7、9.2和 18.7天
The toxicity of Beauveria bassiana to Myzus persicae at 2 8,2 1,16 and 11 ℃ was determined indoors. The toxicity of Beauveria bassiana to Myzus persicae was analyzed by using the time-dose-mortality model. The results showed that the Myzus persicae started to die early at 28 and 21 ° C, and soon reached the higher mortality rate. For example, at a concentration of 107 spores / ml, peach aphids die 3 to 4 days after the inoculation, with a mortality rate of 10% on day 6. Beauveria is more lethal to Myzus persicae than 2 ℃ at 21 ℃. With the same concentration treatment, Myzus persicae died at 6 and 11 days after inoculation at 16 and 11 ℃ respectively, and the mortality rate reached more than 90% after 10 days and 20 days. The T5 0 values of Beauveria bassiana against Myzus persicae were 5.3, 3.7, 9.2 and 18.7 days at 28, 1, 16, and 11 ℃, respectively, when treated with 10 6 spores / ml spore solution