莱氏野村菌对斜纹夜蛾幼虫的致病性

研究了莱氏野村菌(Nomuraea rileyi)MZ060727-XW菌株5个浓度(3.5×104~3.5×108个/mL)对斜纹夜蛾2龄和3龄幼虫的致病性。在3.5×108个/mL孢子浓度下斜纹夜蛾2龄幼虫死亡率最高达88.58%,3龄幼虫死亡率最高达83.84%,2龄幼虫的LC50为(1.898±0.162)×104个/mL,3龄幼虫的LC50为(3.293±0.108)×104个/mL。在3.5×104~3.5×108个/mL浓度处理下2龄幼虫的LT50依次为(6.33±0.18)、(5.16±0.16)、(4.84±0.14)d和(4.27±0.11)d,3龄幼虫的LT50分别为(7.67±0.15)、(6.14±012)(、5.28±0.14)d和(4.69±0.17)d。

Pathogenicity of Nomuraea rileyi against Spodoptera litura

The pathogenicity of Nomuraea rileyi MZ060727 XW to the 2nd and 3rd instar larvae of Spodoptera litura (Fabricius) under five different concentrations from 3.5×104 to 3.5×108 spores/mL was determined. The results indicated that the mortality rate of the 2nd and the 3rd instar larvae caused by N. rileyi MZ060727 XW was 88.58% and 83.84%, respectively, under the concentration of 3.5×108 spores/mL. At the 8th day, the LC50 of the 2nd instar larvae was (1.898±0.162)×104 spores/mL, and LC50 of the 3rd instar larvae was (3.293±0.108)×104 spores/mL. The LT50 values of the 2nd instar larvae were (6.33±0.18)d, (5.16±0.16)d, (4.84±0.14)d and (4.27±0.11)d, respectively, under different concentrations, and LT50 values of the 3rd instar larvae were (7.67±0.15)d, (6.14±0.12)d, (5.28±0.14)d and (4.69±0.17)d,respectively.