Biologie und Bekämpfung des Schwarzen Triebrüßlers,Ceutorhynchus picitarsis Gyll. (Col., Curculionidae)

Büchi, R.

doi:10.1007/bf01905922

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…Competition between such closely related taxa of Ceutorhynchus is very likely to occur in species occupying the same host, but temporal and spatial partitioning may reduce competition 9 which in turn could explain some differences in oviposition behavior on OSR of the four Ceutorhynchus species. Adult C. picitarsis occupy OSR from mid‐September when females perforate the leaf veins, petioles and stems, and lay their eggs under the epidermis from mid‐October, 10 whereas females of C. pallidactylus oviposit into petioles in April shortly after females of C. napi oviposit into growing stems in March/April 11 . Females of C. obstrictus begin to lay single eggs inside OSR pods in late spring 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Frequency and spatial distribution of knock‐down resistance (kdr) to pyrethroids in multiple oilseed rape pest species of the genus Ceutorhynchus

Daum

Brandes

Heimbach

et al. 2023

Pest Management Science

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BackgroundThe protection of European oilseed rape (OSR) from damaging insects relies on pyrethroid insecticides, but the development of resistance in key coleopteran pests such as the pollen beetle (Brassicogethes aeneus) and the cabbage stem flea beetle (Psylliodes chrysocephala) has resulted in reduced effectiveness of these insecticides. The sodium channel gene mutation L1014F knock‐down resistance (kdr) is a contributing factor in resistance to pyrethroids in B. aeneus and P. chrysocephala, but little is known about the status of resistance in weevils of the genus Ceutorhynchus (Coleoptera: Curculonidae). Therefore, the present study investigated pyrethroid susceptibility and the presence of the kdr mutation in four Ceutorhynchus species.ResultsThe kdr mutation in either its heterozygous or homozygous form was found in all investigated Ceutorhynchus species (C. picitarsis, C. pallidactylus, C. napi and C. obstrictus). Samples where pyrethroids in bioassays still provided control at 100% field rate or below contained kdr at frequencies of ≤12.5%, whilst bioassays using 100% field rate that did not control Ceutorhynchus populations contained homozygous resistant individuals at frequencies of greater than 55%. Field sampling demonstrated that kdr frequencies in populations of C. picitarsis and C. obstrictus collected from across France and Germany ranged from 0 to 100%.ConclusionThe present study demonstrated the potential of all four Ceutorhynchus species tested to develop pyrethroid resistance via the L1014F (kdr) mutation. Although kdr frequency varies among species and geographic locations, the risk of loss of pyrethroid insecticide effectiveness is high. Integration of other control tools for resistance management is therefore needed. © 2023 Society of Chemical Industry.

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