Use of life tables to predict the impact of introducing exotic parasitoids, against the cabbage seedpod weevil in North America

Gillespie, D. R.; Broadbent, A. B.; Mason, Peter G.; Haye, Tim; Clarke, Peggy; Goettel, Mark S.; Leung, Benjamin

doi:10.1080/09583157.2019.1625028

Cited by 3 publications

(7 citation statements)

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“…In importation biological control, life table studies in the native range of an insect pest are an important tool to identify potential biological control agents that impact the pest's generational mortality, assuming that the impact in the invaded range would be similar if the agent were introduced (Haye et al 2010;Jenner et al 2010;Gillespie et al 2019). In addition, life tables in the introduced range can help to identify the life stages of the pest during which additional mortalityfor example, due to the release of an exotic natural enemycould significantly reduce population growth (Toepfer and Kuhlmann 2006;Haye et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Ideally, life tables are conducted in both the native and the introduced ranges to evaluate if the introduction of a given biological control agent could have substantial impact on the target. Following this approach, multiple decrement life tables show that the introduction of the European parasitoid Trichomalus perfectus (Walker) (Hymenoptera: Pteromalidae) into canola-growing regions of Canada would have the potential to substantially reduce populations of the invasive cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham) (Coleoptera: Curculionidae) (Gillespie et al 2019).…”

Section: Discussionmentioning

confidence: 99%

“…In other regions of Canada, such as Prince Edward Island, where diamondback moth may have increasing populations (R o > 1.0) and low larval mortality, the addition of D. collaris may be more promising. Life table data from different regions of Canada could help to predict where the introduction of D. collaris on diamondback moth populations would have important impact, as was demonstrated for the cabbage seedpod weevil, C. obstrictus (Gillespie et al 2019). Furthermore, if D. collaris is deemed to be a potential candidate for introduction in Canada, host range and competitive interaction studies are needed to assess the ecological safety of such an introduction.…”

Section: Discussionmentioning

confidence: 99%

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The impact of parasitoids on diamondback moth in Europe: a life table approach

et al. 2021

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Diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae), was first recorded in North America from Europe about 150 years ago and can be a significant pest of canola in Western Canada. Because parasitism of P. xylostella in Canada is generally low, the introduction of one or more additional exotic parasitoids from Europe is being considered to increase the suppression of P. xylostella populations. Life table studies to determine the impact of parasitoids on diamondback moth populations in Europe were conducted in northwestern Switzerland in 2014–2016. Net reproductive rates were found to be less than one in seven out of eight life tables, suggesting that P. xylostella populations in Switzerland are mostly driven by immigration and recolonisation. In total, seven primary parasitoid species and one hyperparasitoid were associated with diamondback moth. Pupal parasitism by D. collaris reached up to 30%, but because generational mortality was mainly driven by abiotic mortality factors and predation of larvae, the overall contribution of pupal parasitism was low (< 6%). In regions of Canada, where P. xylostella may have increasing populations and low larval mortality, the addition of D. collaris may be a promising approach. Life table studies across Canada are necessary to determine the need for such intervention.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The impact of parasitoids on diamondback moth in Europe: a life table approach

et al. 2021

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“…In most life table studies (e.g., Haye et al 2010;Gillespie et al 2019), unknown factors contribute a large proportion of the mortality observed. These may be abiotic (e.g., rainfall, wind, dislodgement) or biotic (e.g., disease and predation by ground dwelling or aerial insects, birds, or small mammals) and are difficult to measure.…”

Section: Mortality Assessment and Life Table Constructionmentioning

confidence: 99%

“…They may also identify niches in life cycles where introductions of natural enemies could be useful. For example, life table studies of the cabbage seedpod weevil, Ceutorhynchus obstrictus Marsham (Coleoptera: Curculionidae), conducted in the area of origin (Haye et al 2010) and area of introduction (Gillespie et al 2019) enabled comparison of the parasitoid fauna between the two areas. Two major parasitoids of C. obstrictus larvae not present in the area of introduction were identified as having high impact in the area of origin.…”

Section: Introductionmentioning

confidence: 99%

The parasitoid complex of diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae), in Canada: impact and status

et al. 2022

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Diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae), a globally important pest of Brassicaceae crops, migrates into all provinces of Canada annually. Life tables were used to determine the mortality levels contributed by the parasitoid complexes associated with diamondback moth in British Columbia, Ontario, Prince Edward Island, and insular Newfoundland. Overall, diamondback moth populations showed high generational mortality (> 90%) in all provinces, although parasitism levels were generally low. The net reproductive rate of increase in diamondback moth was less than 1.0 (populations declined) in both years in British Columbia and in each of two years in Newfoundland and Ontario, but it was greater than 1.0 in all three years in Prince Edward Island. Lower parasitism levels were found in Prince Edward Island (3.0–6.3%) compared with other provinces (8.4–17.6%, except one year in British Columbia). Diadegma insulare was the main larval parasitoid found; it was present in all provinces. Microplitis plutellae was present in all provinces except British Columbia. Oomyzus sokolowskii was found in British Columbia and Ontario. The parasitoid community documented from sentinel sampling was less diverse than that found through destructive sampling. Hypotheses are provided to explain the presence of major parasitoids. Increasing larval parasitism would have the largest effect on diamondback moth population growth in Canada.

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The potential for reducing non-target effects on parasitoids of Ceutorhynchus obstrictus Marsham (Coleoptera: Curculionidae) through spatially targeted insecticide applications

Hausmann

Brandes

2022

J Plant Dis Prot

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Insecticide applications against the cabbage seedpod weevil, Ceutorhynchus obstrictus Marsham (Coleoptera: Curculionidae), in oilseed rape are conducted during the flowering of the crop. During the flowering period, many parasitoids of pest species are abundant in the crop, and therefore, the preservation of natural pest regulation mechanism is especially important. Parasitism often has a substantial mortality factor in pest populations and as far as possible, parasitoids need to be protected from harmful non-target effects of insecticides. In the present study, the effects of three different insecticidal products on the parasitism of cabbage seedpod weevil larvae were investigated. Additionally, the effects of a spatial targeting of insecticides, using conventional and dropleg application technique, were compared. This was done in field trials within a completely randomized block design and four replications at one trial site in 2019 and two sites in 2020. The parasitoid species Trichomalus perfectus Walker and Mesopolobus morys Walker (both Hymenoptera: Pteromalidae) were abundant in almost equal shares in 2019, whereas M. morys was the most important species in 2020. Only in 2019 were harmful effects of the insecticide Biscaya (a.i. thiacloprid) on parasitism rates of C. obstrictus larvae observed. Clear benefits, due to spatial targeting of insecticides using the dropleg technique on parasitoids, were not found. The harmfulness of insecticides is probably affected by properties of different insecticidal products and the temporal coincidence of parasitoid occurrence and insecticide application.

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Use of life tables to predict the impact of introducing exotic parasitoids, against the cabbage seedpod weevil in North America

Cited by 3 publications

References 32 publications

The impact of parasitoids on diamondback moth in Europe: a life table approach

The impact of parasitoids on diamondback moth in Europe: a life table approach

The parasitoid complex of diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae), in Canada: impact and status

The potential for reducing non-target effects on parasitoids of Ceutorhynchus obstrictus Marsham (Coleoptera: Curculionidae) through spatially targeted insecticide applications

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