象甲虫生真菌对剪枝栎实象幼虫的毒力作用  

Evaluation on Virulence of Entomogenous Fungi of Oak Nut Weevil to Larvae of Mechoris ursulus

作　　者：白雪[1] 艾景阳[1] 李冬冬[1] 张智英[1] 苏文华[1] 王旭[1] 

机构地区：[1]云南大学生态学与地植物学研究所,云南昆明650091

出　　处：《西南林业大学学报（自然科学）》2012年第6期64-67,共4页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家自然科学基金(30960061)项目资助

摘　　要：用从病变象甲幼虫上分离得到的14种真菌,对剪枝栎实象幼虫作毒力试验,并筛选出2株有较强致病性的菌株进行浓度梯度测试。结果表明:6号被孢霉科被孢霉属菌和7号丛梗孢科青霉属菌具有较强的致病力,致死中时分别为22.03 d和29.41 d,致死中浓度分别为3.03×105、2.84×105个/mL。14 strains of entomogenous fungi were isolated from the Mechoris ursulus nymphae with pathological symptom, and these 14 strains of entomogenous fungi were employed in the virulence test against the M. ursulus nymphae. 2 of the strains, i. e. , NO. 6 and NO. 7 with stronger infestation effect were screened out to conduct the concentration gradient test. The results showed that the median lethal time （ LT50 ） of these two strains was 22.04 d and 29.42 d, and the median lethal concentration （LC50） of these two strains was 3.03 ×10^5 and 2. 84 ×10^5 re- spectively.

关 键 词：剪枝栎实象 虫生真菌 致病性 生物防治 毒力 

分 类 号：S763.38[农业科学—森林保护学]