【摘要】 采用"孢子浴"法测定了新蚜虫疠霉菌株对云南省呈贡、大理、通海、元谋4地黄绿色和红色体色生物型桃蚜的毒力.结果表明:在分生孢子0.25~68.28个/mm2接种剂量下对红色和黄绿色2种生物型桃蚜的毒力无明显差异,对云南省呈贡、大理、元谋和通海4地菜区红色生物型蚜虫的剂量效应常数分别为0.91,1.36,1.21和1.15;对黄绿体色生物型蚜虫的剂量效应常数分别为1.09,1.50,1.30和1.26.接种后第1~7天,呈贡、大理、通海、元谋4地红色桃蚜接种新蚜虫疠霉菌后,LT50分别为4.9~4.0d(10.72~65.48孢子/mm2),4.8~3.2d(10.72~62.42孢子/mm2),4.6~3.6d(16.82~65.48孢子/mm2),5.2~3.7d(11.21~63.45孢子/mm2).对4地黄绿色体色桃蚜接种新蚜虫疠霉菌后,LT50分别为4.4~3.8d(26.37~67.6孢子/mm2),5.1~3.3d(8.91~60.26孢子/mm2),5.1~3.5d(8.7~58.09孢子/mm2),4.2~2.9d(9.91~56.81孢子/mm2).综合以上毒力测定结果,在相同接种剂量下,新蚜虫疠霉菌株对黄绿色和红色2种体色生物型桃蚜的致死中时LT间无显著差异.更多还原

【Abstract】 Using the spore-shower method,the virulence of Pandora neoaphidis against the different geographical populations and two body-color biotypes of green peach aphid(Myzus persicae)was tested in the laboratory with inoculation dosages from 0.25-68.28 spores/mm2.The resulting mortality data were analyzed and fitted to a time-dose-mortality model.The results showed that the P.neoaphidis isolate tested was highly virulent against M.persicae,and with a latent period of about 3 days in the aphid.The value of LT50 was 4.9-4.0 d(10.72-65.48 spores/mm2),4.8-3.2 d(10.72-62.42 spores/mm2),4.6-3.6 d(16.82-65.48 spores/mm2)and 5.2-3.7 d(11.21-63.45 spores/mm2)for the red body-colour type of M.persicae from Chenggong,Dali,Tonghai and Yuanmou,respectively.The value of LT50 was 4.4-3.8 d(26.37-67.6 spores/mm2),5.1-3.3 d(8.91-60.26 spores/mm2),5.1-3.5 d(8.7-58.09 spores/mm2)and 4.2-2.9 d(9.91-56.81 spores/mm2)for the yellow-green body-colour type of M.persicae from Chenggong,Dali,Tonghai and Yuanmou,respectively.Therefore,with similar inoculation dosage,no significant differences in the virulence of P.neoaphidis against different geographical and different body-color populations of M.persicae were observed.更多还原