02381nas a2200181   4500008004100000020001400041245012100055210006900176260001000245300001200255490000800267520170500275653003101980100001802011700001802029700001702047856013502064       2007                        eng d  a0013-874600aLife history, larval morphology, and nearctic distribution of Ceutorhynchus subpubescens (Coleoptera: Curculionidae)0 aLife history larval morphology and nearctic distribution of Ceut  cMarch  a178-1860 v1003 aSince the description of Ceutorhynchus subpubescens LeConte (Coleoptera: Curculionidae) >125 yr ago, very little information has been published on its biology, taxonomy, or distribution. We conducted studies in southern Alberta, Canada, to investigate aspects of its life history and host plant feeding preferences. Preimaginal life stages of C. subpubescens were described for the first time, and data were compiled on its North American distribution. Ceutorhynchus subpubescens was univoltine. Adults emerged from overwintering sites in shelterbelts in late April to early May, and first occurred on host plants in May. Eggs were laid into apical stem regions of flixweed, Descurainia sophia (L.) Webb (Brassicaceae), and hatched to larvae that mined the stems, feeding primarily on pith tissue. Three instars developed within D. sophia. When mature, the final instar bored an exit hole in the primary stem, just below the juncture of a lateral shoot. Developmental time from eggs to final instars required only 35- 45 d, an adaptation that accommodated the rapid development of D. sophia hosts. Setal numbers on the mouthparts and head capsule distinguished final instars of C. subpubescew from its sympatric congeners, Ceutorhynchus neglectus Blatchley and Ceutorhynchus obsttictus (Marsham). New distribution records for the species include Alberta, Arizona, Montana, Nebraska, New Mexico, Oregon, Saskatchewan, South Dakota, and Washington. C. subpubescew has adapted to exploit a resource-rich habitat, where larvae are free from interference from predators and parasitoids; however, its relatively rare occurrence in western North America is surprising given the abundance of its host plants.10aCeutorhynchus subpubescens1 aDosdall, L.M.1 aUlmer, B., J.1 aBouchard, P.  uhttps://weevil.myspecies.info/life-history-larval-morphology-and-nearctic-distribution-ceutorhynchus-subpubescens-coleoptera-curcu02377nas a2200217   4500008004100000020001400041245015600055210006900211260000800280300001200288490000800300520156800308653002901876100001801905700001801923700001701941700002201958700002201980700002202002856013502024       2011                        eng d  a0008-347X00aThe parasitoid communities associated with an invasive canola pest, Ceutorhynchus obstrictus (Coleoptera: Curculionidae), in Ontario and Quebec, Canada0 aparasitoid communities associated with an invasive canola pest C  cSep  a524-5370 v1433 aSurveys were conducted to determine the parasitoid communities associated with the cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham), an important invasive pest of canola in Ontario and Quebec, Canada. More than 18 species of Chalcidoidea (Hymenoptera) were associated with this pest through mass rearings from canola siliques. In southwestern Ontario, the most abundant species were a species of Chlorocytus Graham (23.6%-48.6%), Lyrcus perdubius (Girault) (0%-53%), L. maculatus (Gahan) (2.8%-14.7%), and species of Pteromalus Swederus (0.6%-23.1%) (Pteromalidae). In contrast, the most abundant species in Quebec were Trichomalus lucidus (Walker) (Pteromalidae) (33.3%-56.4%), unidentified Eulophidae (2.1%-39.1%), Mesopolobus gemellus Baur and Muller (Pteromalidae) (1.3%-21.4%), and Necremnus tidius (Walker) (Eulophidae) (11.5%-19.3%). In the Ottawa, Ontario, area, parasitoids were first recovered in 2008, and Trichomalus perfectus (Walker) (Pteromalidae), M. gemellus, and species of Pteromalus were most prevalent. Mesopolobus gemellus and T perfectus are reported in North America for the first time. Although existing communities appear to provide substantial parasitism (e.g., 6.3%-26.3% in 2006), species composition varies among years and differs from that in other regions in North America. Thus, parasitism levels and parasitoid communities of the cabbage seedpod weevil should be monitored to assess whether these will increase or there is a need to introduce more host-specific species from Europe that could provide greater mortality.10aCeutorhynchus obstrictus1 aMason, P., G.1 aMiall, J., H.1 aBouchard, P.1 aGillespie, D., R.1 aBroadbent, A., B.1 aGibson, G., A. P.  uhttps://weevil.myspecies.info/parasitoid-communities-associated-invasive-canola-pest-ceutorhynchus-obstrictus-coleoptera-curculion00474nam a2200109   4500008004100000245008200041210006900123260003200192100001900224700001700243856010400260       2008                        eng d00aWeevils of Canada and Alaska, Volume 2. Coleoptera, Curculionidae, Entiminae.0 aWeevils of Canada and Alaska Volume 2 Coleoptera Curculionidae E  aOttawa, CanadabNRC Press, 1 aBright, D., E.1 aBouchard, P.  uhttps://weevil.myspecies.info/weevils-canada-and-alaska-volume-2-coleoptera-curculionidae-entiminae