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海南瓜实蝇致病细菌的分离鉴定及杀虫活性测定

马晓燕, 路斌冰, 王萌, 杨叶   

  1. 海南大学环境与植物保护学院/热带生物资源教育部重点实验室, 海口 570228
  • 收稿日期:2014-08-28 修回日期:1900-01-01 出版日期:2015-06-08 发布日期:2015-06-08
  • 通讯作者: 杨叶

Identification of Bacteria from Bactrocera cucurbitae (Coquillett) in Hainan and Determination of Its Insecticidal Bioactivity

MA Xiaoyan, LU Binbing, WANG Meng, YANG Ye   

  1. Key Laboratory of Tropical Biological Resources, Ministry of Education/College of Environment and Plant Protection, Hainan University, Haikou 570228, China
  • Received:2014-08-28 Revised:1900-01-01 Online:2015-06-08 Published:2015-06-08

摘要: 从海南自然感病死亡的瓜实蝇上分离到1株对瓜实蝇高毒力的致病性菌株BC-hn,对其生防潜能进行评估.通过形态学观察、生理生化测定和16S rDNA序列测定分析,确定菌株BC-hn为黏质沙雷氏菌Serratia marcescens;用1×108 cfu/mL的菌悬液接种瓜实蝇进行室内杀虫活性测定,研究结果表明接种7 d后成虫的平均死亡率为81.2%;卵孵化抑制率为37.5%,幼虫平均死亡率为53.0%,对蛹羽化的抑制作用最小,平均死亡率24.0%.用浓度为1×104~1×108菌悬液处理瓜实蝇成虫,7 d后的LC50为1.16×106 cfu/mL.对其他昆虫致病性测定发现,菌株BC-hn对菜蚜也有较高的致死作用,接种7 d后的死亡率为60.0%,但对供试的斜纹夜蛾、菜青虫、玉米螟和黄粉虫的死亡率均低于10.0%.菌株BC-hn对瓜实蝇成虫的毒力高,并对昆虫具有一定的专化性,具有较高的防治潜力.

Abstract: A virulent strain BC-hn with high infectivity was isolated from naturally infected and dead Bactrocera cucurbitae collected from Hainan and evaluated for its insecticidal bioactivities.The strain BC-hn was identified as Serratia marcescens by morphological, cultural, physiological and biochemical tests, and 16S rDNA sequences analysis. Bioactivity of BC-hn(1×108 cfu/mL)against B. cucurbitae and other insects were assayed in laboratory.Mortalities of B. cucurbitae adult, egg, larvae and pupa were 81.2%, 37.5%, 53.0% and 24.0% at 7 d post-treatment, respectively. When adults of B. cucurbitae were inoculated with concentrations of 1×104—1×108 cfu/mL of BC-hn, LC50 was 1.16×106 cfu/mL at 7 d post-treatment. The strain was also effective against Lipaphis erysimi larvae, resulting in a mortality of 60%, but not effective against larvae of Prodenia litura (Fabricius), Pieris rapae (Linnaeus), Pyrausta nubilalis (Hubern), Tenebrio molitor (L.), where mortalities were lower than 10%.These results show thatBC-hn is host specific in virulence and highly virulent against adults of B. cucurbitae.

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