摘要
强大小蠹Ｄ.ｖａｌｅｎｓＬｅｃｏｎｔｅ,俗名红脂大小蠹ＲｅｄＴｕｒｐｅｎｔｉｎｅＢａｒｋＢｅｅｔｌｅ是重要的松树害虫,它对树种的选择不严格,能危害多种松树,为了便于识别,特将其形态学特征和生物学特征加以阐述。形态学特征 体长53～83ｍｍ,平均约73ｍｍ,体长为体...
Morphologicalcharacters:bodylength 5 .3 8.3mm ,2 .1timesaslongaswide,withanaveragesizeabout7.3mm ,Fronsmoderatelyconvexwiththreeelevations,ofwhichtheupperoneisjustbelowtheendofepicranialsutureandthelowertwoarelaterallysitedonmedianfrons;epistomalprocessbroad ,morethan 0 .5 5timesaswideasdis tancebetweeneyes,armsofepistomalprocessobliqueabout 2 0°fromhorizontallevelandprominentlyandroundlyelevated,surfaceofepistomalprocesslongitudinallyandbroadlyconcave.Pronotum 0 .73timesaslongaswide,puncturesonlateralareasofpronotum( proepisternum)finenotveryclose.Elytra 1.5timesaslongaswide,2 .2timesaslongaspronotum ,elytraldeclivitywithallinterstriaeshining,interstriae 1notelevated,interstriae 2neithernarrowernormoreimpressedthaninterstriae 1and 3,alldeclivitalinterstriaecoarselygranulated ,granulationsdis tributedsometimesconfusedandsometimesregularly. Biologicalcharacters.Thisspeciesoverwinterseitherasadultsoraspartlygrownlarvae.Itisassumedthatthereisoverlappingofgenerations,asthebeetlescanbeseeninallthesummermonths.Thebeetlesselecttoattackinstumps,weakenedordyingtreeswiththetrunklargerthan 2 0cmofdiameteratbreastheight.Thisspeciesisasecondarypestofpinesinitsnativelocalityranges.There,itarrivesonthetreebolequitesometimeaftermoreag gressivespecieshaveattacked,suchasDendroctonusbrevicomisLeConte.Butundersomeparticularconditionsitcan surelyattacklivingtreesandbecomesaprimarypest.Thespeciesisofmonogamyinreproductionactivity.Femalebeetlesarethepioneerstoattacknewtrees.Theyboleordinarilyatthetrunkafewcentimetersabovethegroundlevel,sometimesbolehigherandreachtheextremityof 1.8mabovethegroundlevel.Whentheentranceholeisex cavatedtothephloemtissues,wherethemalebeginstojointhefemaleandbothworktogether,theegggallerystartstoturneitherupwardsordownwards.Egggalleriesarevariableinshape.Theymaybeinlinnearpatternof40cminlengthincommonandmaybeofbroadcavetypeexcavation.Betweenthetwoextreme.Thereareaseriesofin tergradations.Theeggsaredepositedingroupsof 10to 40ormore,alongonesideofegggalleryawayfromthemainactivityareaoftheparentalbeetles.Eggmassesarecoveredwithcompactlargeroffrass.Thelarvaemineincongresscaveinphloemtissues.Theydonotmineindividuallyandthereforenolarvaltunnelsappearedinthegallerypatterns.Thecommonlarvalcavityisfilledwithreddishfrassbehindthegrowinglarvae.Whenthelarvaegetmaturethepupalcellsareformedinfrassalongtheextremityofthecommonlarvalcavity
出处
《动物分类学报》
CSCD
2000年第1期120-120,43,共2页
Acta Zootaxonomica Sinica
