拟双角斯氏线虫侵染红脂大小蠹幼虫的研究  

INFECTIVITY OF ENTOMOPATHGENIC NEMATODE STEINERNEMA CERATOPHORUM TO BARK BEETLE DENDROCTONUS VALENS LARVAE

作　　者：简恒[1] 杨秀芬[1] 刘峥[1] 杨怀文[1] 苗振旺 

机构地区：[1]中国农业科学研究院生物防治研究所,北京100081 [2]山西省森林病虫害防治检疫站,太原030012

出　　处：《林业科学》2002年第1期157-159,共3页Scientia Silvae Sinicae

基　　金：农业部农作物病虫草害生物防治资源研究与利用重点开发实验室资助

摘　　要：The bark beetle, Dendroctonus valens LeConte, infested mainly pine tree over 30 year old. It has been a disaster of pine forest in Shanxi province and part areas of Hebei and Henan provinces since 1998. This research reported the results of infectivity of 7 species belonged to Steinernema and Heterorhabditis to matural larvae of the bark beetle Dendroctonus valens LeConte in laboratory. Steinernema ceratophorum, isolated from Jilin province in Northeast China, was the best nematode species for infection of the pest larvae among the 7 species of nematodes. The mortality of insect larvae reached to 90% after exposure to nematode for 96 hours. The LC 50 based on 3 day insect mortality was 24±4.2 infective juveniles. Other nematode species tested in this trial were not sensitive to the larvae of Dendroctonus valens. Each host cadaver could produce 6770 infective juveniles. These new generation nematodes would provide nematode resource to infect healthy insect larvae living in bark during field application. This result would be helpful for finding a new way to the integrated control of the bark beetle Dendroctonus valens.The bark beetle, Dendroctonus valens LeConte, infested mainly pine tree over 30 year old. It has been a disaster of pine forest in Shanxi province and part areas of Hebei and Henan provinces since 1998. This research reported the results of infectivity of 7 species belonged to Steinernema and Heterorhabditis to matural larvae of the bark beetle Dendroctonus valens LeConte in laboratory. Steinernema ceratophorum, isolated from Jilin province in Northeast China, was the best nematode species for infection of the pest larvae among the 7 species of nematodes. The mortality of insect larvae reached to 90% after exposure to nematode for 96 hours. The LC 50 based on 3 day insect mortality was 24±4.2 infective juveniles. Other nematode species tested in this trial were not sensitive to the larvae of Dendroctonus valens. Each host cadaver could produce 6770 infective juveniles. These new generation nematodes would provide nematode resource to infect healthy insect larvae living in bark during field application. This result would be helpful for finding a new way to the integrated control of the bark beetle Dendroctonus valens.

关 键 词：红脂大小蠹 拟双角斯氏线虫 侵染 油松害虫 生物防治 

分 类 号：S763.712.4[农业科学—森林保护学] S763.380.6[农业科学—林学]