Biological traits and life history of Pagiophloeus tsushimanus(Coleoptera:Curculionidae),a weevil pest on camphor trees in China  

作　　者：Cong Chen Congcong Zhang Shouyin Li Han Zhu Binqi Fan Yan Wang Peng Su Yangyang Han Dejun Hao 

机构地区：[1]Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,People’s Republic of China [2]College of Forestry,Nanjing Forestry University,Nanjing 210037,People’s Republic of China [3]Forest Station of Shanghai,Shanghai 200040,People’s Republic of China

出　　处：《Journal of Forestry Research》2021年第5期1979-1988,共10页林业研究（英文版）

基　　金：supported by the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX19_1077);the Science and Technology Commission of Shanghai Municipality(18,391,903,200);the Shanghai Landscaping&City Appearance Administrative Bureau(G161206)。

摘　　要：Cinnamomum camphora(L.)J.Presl.(Laurales:Lauraceae)is widely cultivated as an important landscape tree species in many urban areas in South China,especially in Shanghai City.Pagiophloeus tsushimanus Morimoto has become a destructive insect pest of C.camphora plantations in Shanghai,but the biological and ecological traits of this pest remain largely unknown.In this study,we investigated the damage and life history and determined the larval instar of P.tsushimanus.The results indicated that P.tsushimanus is a monophagous weevil pest,and C.camphora is the unique host tree species.C.camphora plantations in all administrative districts of Shanghai have been seriously damaged by P.tsushimanus.Adults often aggregate for feeding on the tender bark of twigs and occasionally on newly emerged buds.After experiencing damage,the twigs shrink and crack and the buds will shrink.Adults tend to repeatedly mate and oviposit,and all females lay single eggs at a time.Eggs will be covered with a mixture of secretions and wood chips by female adults.Larvae(1 st-2 nd instar)feed on the phloem,while 3 rd-5 th instar can bore into the phloem and the cambium.Massive tunnels,including three shapes(inverted"L",inverted"T",and inverted"Z"),were observed in the trunk of each tree,and resulted in swelling of the outer bark.P.tsushimanus has one life cycle per year in Shanghai.Both adults and larvae(3 rd-5 th instar)overwinter from early November to early April.Adults overwinter in grooves on the underside of branches or at branch nodes,and larvae overwinter in tunnels.Five larval instars of P.tsushimanus were determined according to Dyar’s and Crosby’s rules.The biological traits and life history of P.tsushimanus have been identified and can provide guidance in terms of pest control and plantation management.

关 键 词：Cinnamomum camphora Damage traits Life cycle Dyar’s rule Head capsule width 

分 类 号：S763.7[农业科学—森林保护学]