不同昆虫寄主对昆虫病原线虫共生菌的敏感性比较

用菜青虫、棉铃虫、甜菜夜蛾、玉米螟、粘虫、黄粉虫等 6种昆虫对 1 0株昆虫病原线虫共生菌进行了敏感性测定。结果表明 :供试菌株对 6种昆虫都有胃毒活性 ,不同菌株对同一种昆虫的毒力差别较大 ,同一菌株对不同昆虫差别也很大。 1 0株菌在 1 2 0h对菜青虫的校正死亡率和体重抑制率均最高 ,显然是最敏感的寄主。在 1 0株共生菌中 ,XenorhabdusnematophilaHB3 1 0 5 9菌株的胃毒活性最高。

Susceptivity of different host insects to symbiotic bacteria of entomopathogenic nematodes

Xenorhabdus and Photorhabdus were entomopathogenic bacteria symbiotically associated with insect pathogenic nematodes.Ten representative strains are isolated from their nematode symbionts.They were highly oral virulent to insects,varying among different species and isolates, and bioassayed against several insect pests. Pieris rapae was found the most sensitive host species to all ten symbiotic bacteria isolates.The oral toxicity of Xenorhabdus nematophila HB310-59 was highest among all 10 symbiotic bacteria strains.