寄主植物对玫烟色拟青霉致病力的影响

通过比较茄子、黄瓜和节瓜三种寄主植物上烟粉虱的LC_(50)和LT_(50)值,评价了寄主植物对玫烟色拟青霉致病力的影响。烟粉虱的累计校正死亡率回归分析结果表明:在处理后的第8～14天,不同寄主植物上玫烟色拟青霉对烟粉虱的LC_(50)值差异显著;茄子、黄瓜和节瓜上烟粉虱的LC_(50)最小值出现的时间不同,分别在处理后的第14、10、12天。当玫烟色拟青霉的浓度为1．0×10~5和5．0×10~5分生孢子/mL时,黄瓜与茄子、节瓜上烟粉虱的LT_(50)值差异显著;当浓度为5．0×10~6～1．0×10~8分生孢子/mL时,三种寄主植物上烟粉虱的LT_(50)值差异不显著。

Effect of host plant on the potential of Paecilomyces fumosoroseus

The effect of host plant on the potential of Paecilomyces fumosoroseus for controlling Bemisia tabaci were evaluated by comparing the LC₅₀ and LT₅₀ values of B.tabaci on eggplant, cucumber and melon. The results of regression analysis on the accumulative adjusted mortalities of B.tabaci and the different concentrations of P.fumosoroseus showed that LC₅₀ values of B.tabaci were significantly different with the B.tabaci on different host plants from eight to fourteen days after treatments, the least LC₅₀ of B.tabaci on eggplant, cucumber and melon appeared in fourteen days, ten days and twelve days after treatments, respectively. The LT₅₀ values of B.tabaci are significantly different on host plants between cucumber and eggplant, cucumber and melon with the concentration of 1.0×10⁵ and 5.0×10⁵ conidia/mL of P.fumosoroseus, respectively, but there are no significant difference on the concentrations from 5.0×10⁶ to 1.0×10⁸ conidia/mL of P.fumosoroseus.