Distribution and Control of the Cabbage Seedpod Weevil in California

Carlson, E; Lange, Harry W.; Sclaroni, R. H.

doi:10.1093/jee/44.6.958

Cited by 12 publications

(6 citation statements)

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“…Nearctic: see Material examined; the records from Alberta represent a new provincial record. Carlson et al (1951) also reported a single female from California (San Joaquin Co., Thornton area), which was not located.…”

Section: Distributionmentioning

confidence: 99%

“…Buntin (1998) stated that T. perfectus represented 96%-100% of all parasitoids reared from canola seedpods infested with C. obstrictus near Griffon, Georgia, during 1994Georgia, during -1996however, no Trichomalus species were found among 1124 voucher specimens (UGCA). The vast majority of specimens consist of Lyrcus maculatus (Gahan), which was recorded previously as a parasitoid of C. obstrictus in California (Carlson et al 1951), Idaho (Walz 1957), and Washington (Hanson et al 1948) under the generic names Trimeromicrus or Zatropis, both of which are now considered synonyms of Lyrcus (see Bouek 1993).…”

Section: Diagnosis (Based On North American Specimens)mentioning

confidence: 99%

“…The weevil initially was a pest of mustard, cabbage, turnip, rutabaga, and Brussels sprouts (Brassica spp.) grown for seed (Hanson et al 1948;Carlson et al 1951;Walz 1957). Since its introduction it has become an invasive pest throughout much of North America north of Mexico (Brodeur et al 2001;Cárcamo et al 2001;Mason et al 2004) and a major economic pest of brassicaceous oilseed crops including canola and rape (Brassica napus L. and B. rapa L.) (Buntin et al 1995;Dosdall et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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On the misidentification of chalcid (Hymenoptera: Chalcidoidea) parasitoids of the cabbage seedpod weevil (Coleoptera: Curculionidae) in North America

et al. 2005

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Abstract-Previous identifications in North America of Trichomalus perfectus (Walker, 1835) and Mesopolobus morys (Walker, 1848) (Chalcidoidea: Pteromalidae), the principal chalcid parasitoids of the cabbage seedpod weevil (Ceutorhynchus obstrictus Marsham, 1802) in Europe, are shown to be misidentifications of Trichomalus lucidus (Walker, 1835) and Mesopolobus (Xenocrepis) moryoides sp. nov., respectively. Necremnus duplicatus Gahan, 1941 (Chalcidoidea: Eulophidae) is synonymized formally under Necremnus tidius (Walker, 1839) syn. nov., confirming a previous, tentative synonymy. Both sexes of N. tidius, M. moryoides, and T. lucidus are illustrated and compared with those of similar species using macrophotography and scanning electron microphotography. Hypotheses are offered to explain why the principal chalcid parasitoids of the cabbage seedpod weevil differ between North America and Europe and how the three treated species came to be in North America.

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Section: Distributionmentioning

confidence: 99%

Section: Diagnosis (Based On North American Specimens)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the misidentification of chalcid (Hymenoptera: Chalcidoidea) parasitoids of the cabbage seedpod weevil (Coleoptera: Curculionidae) in North America

et al. 2005

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“…The cabbage seedpod weevil is univoltine. Sexually immature adults overwinter in protected areas such as beneath leaf litter in shelterbelts and roadside ditches (Carlson et al 1951;Dmoch 1965). In spring, adults fly from these sites to feed on host plants in the family Brassicaceae (Dmoch 1965).…”

Section: Introductionmentioning

confidence: 99%

Temporal and geographical distribution patterns of cabbage seedpod weevil (Coleoptera: Curculionidae) in canola

et al. 2002

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The cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham), was discovered infesting canola [Brassica napus L. and Brassica rapa L. (Brassicaceae)] in southern Alberta in 1995, and by 1999 its populations had reached outbreak densities. The weevil has dispersed rapidly through cropland in the southern prairies, prompting this study to assess its potential for establishment in Canada's primary region of canola production in the Moist Mixed Grassland and Aspen Parkland ecoregions. In this study, both short- (24 h) and long-term (4 years) distribution patterns of cabbage seedpod weevil were examined, and these data were combined with previously published ecological findings and meteorological data in CLIMEX™ software to predict regions of western Canada where economically important infestations are likely to occur. Adult temporal distributions over 24 h on canola in bud and flower remained restricted primarily to the inflorescence rather than on stems and leaves regardless of time of day. Surveys conducted in commercial canola fields from 1997 to 2000 recorded rapid dispersal of the species to the north and east from the region of southern Alberta where it was initially found. Dispersal occurred at a rate of approximately 55 km/year, and in 2000 C. obstrictus populations were found in Saskatchewan for the first time. The CLIMEX™ model predicts that the distribution of C. obstrictus will eventually encompass the entire region of canola production in western Canada.

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“…The cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae), was first reported infesting commercial fields of canola, Brassica napus L. (Brassicaceae), in southern Alberta, Canada, in 1996 (Butts and Byers 1996). This weevil, introduced from Europe, was first reported in North America in the 1930s (Baker 1936) and is a major limiting factor in the production of canola in Idaho, Oregon, Washington, and California (Carlson et al 1951). Surveys conducted in commercial canola fields in Alberta and Saskatchewan during 1997 to 2000 determined that C. obstrictus had dispersed rapidly through cropland in Alberta and Saskatchewan and posed a major threat to the profitable production of canola throughout western Canada (Dosdall et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of foliar and seed treatments for control of the cabbage seedpod weevil (Coleoptera: Curculionidae) in canola

et al. 2005

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Caged assays and field tests were used to evaluate the effectiveness of organophosphorus, pyrethroid, neonicotinoid, and biologically derived insecticides for reducing populations of the cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham), a new pest of canola in Canada. Complete mortality of caged weevils occurred 48 h after treatment with disulfoton, deltamethrin, carbofuran, oxydemeton-methyl, and chlorpyrifos. Under field conditions, using plots or large strips in commercial fields from 1998 to 2001, only deltamethrin and cyhalothrin-lambda (both pyrethroids) consistently reduced weevil densities, even at high population levels. Chlorpyrifos also significantly reduced weevil numbers and damage in some years, but results were variable and efficacy was too low to manage weevils under outbreak densities. Other insecticides such as spinosad provided moderate weevil control and may have a role in weevil management depending on their effect on beneficial insects relative to more efficacious insecticides. Treatment of canola seed with imidacloprid, lindane, or acetamiprid did not reduce weevil damage. Further research is needed to establish economic thresholds for C. obstrictus in canola, to assess the effect of insecticides on nontarget natural enemies of canola insect pests, and to assess the potential for integration of chemical agents with biological and cultural control strategies. Résumé-Des bioessais en cages et des tests sur le terrain nous ont permis d'évaluer l'efficacitéd'insecticides organophosphorés, pyréthrinoïdes et néonicotinoïdes, ainsi que des insecticides d'origine biologique, pour la réduction des populations du charançon des siliques de colza, Ceutorhynchus obstrictus (Marsham), un nouveau ravageur du canola au Canada. Un traitement au disulfoton, à la deltaméthrine, au carbofuran, à l'oxydéméthon-méthyle ou au chlorpyrifos entraîne une mortalité totale des charançons en cages en 48 h. Dans des parcelles ou des bandes dans des champs commerciaux en conditions naturelles de 1998 à 2001, seules la deltaméthrine et la cyalothrine-lambda (toutes deux des pyréthrinoïdes) réduisent les densités de charançons de façon soutenue, même lorsque les populations sont abondantes. Certaines années, le chlorpyrifos réduit aussi significativement les nombres de charançons et les dommages aux récoltes, mais ses effets sont variables et son efficacité trop faible pour le contrôle des charançons aux densités de niveau épidémique. D'autres insecticides, tels que le spinosad, procurent un niveau de contrôle moyen et peuvent avoir un rôle dans la lutte contre les charançons, tout dépendant de leur impact 476

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Distribution and Control of the Cabbage Seedpod Weevil in California

Cited by 12 publications

References 0 publications

On the misidentification of chalcid (Hymenoptera: Chalcidoidea) parasitoids of the cabbage seedpod weevil (Coleoptera: Curculionidae) in North America

On the misidentification of chalcid (Hymenoptera: Chalcidoidea) parasitoids of the cabbage seedpod weevil (Coleoptera: Curculionidae) in North America

Temporal and geographical distribution patterns of cabbage seedpod weevil (Coleoptera: Curculionidae) in canola

Evaluation of foliar and seed treatments for control of the cabbage seedpod weevil (Coleoptera: Curculionidae) in canola

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