scholarly journals Attractiveness of oilseed rape cultivars to Brassicogethes aeneus and Ceutorhynchus obstrictus as a potential control strategy  

2021 ◽  
Author(s):  
Tomáš Hovorka ◽  
Pavel Saska ◽  
Jitka Stará ◽  
František Kocourek
Keyword(s):  
Oilseed Rape ◽  
Control Strategy ◽  
Negative Impact ◽  
Pollen Beetle ◽  
Brassicogethes Aeneus ◽  
Potential Control ◽  
Ceutorhynchus Obstrictus ◽  
Cabbage Seed Weevil ◽  
Cabbage Seed ◽  
The One

The abundances of two pests, pollen beetle (Brassicogethes aeneus (Fabricius, 1775)) and cabbage seed weevil (Ceutorhynchus obstrictus (Marsham, 1802)), were measured before flowering and in the full bloom of oilseed rape cultivars with different phenologies (two yellow-flowering: DK Exssence (the earliest), DK Sensei (the latest) and one white-flowering in time between yellow-flowering cultivars), and the differences in their abundance in the selected cultivars were determined in plot experiments during 2015–2018. No significant differences in pollen beetle and cabbage seed weevil occurrence were observed between the cultivars in the pre-flowering period, but during flowering, the two yellow-flowering cultivars were more attractive than the white-flowering cultivar for both pests. In the white-flowering cultivar, 57% and 69% reductions in the pollen beetle and cabbage seed weevil populations, respectively, were found relative to the two with yellow flowers. Thus, the use of white-flowering cultivar (less attractive, later flowering) as the main crop and the yellow-flowering cultivar (more attractive, earlier flowering) at field edges, with the width of the one-track line, could serve as a strategy to manage oilseed rape pests during flowering. This control strategy which combines more and less attractive oilseed rape cultivars may contribute to a reduction in the use of pesticides and their negative impact on the environment.  

scholarly journals RNAi efficacy is enhanced by chronic dsRNA feeding in pollen beetle

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Jonathan Willow ◽  
Liina Soonvald ◽  
Silva Sulg ◽  
Riina Kaasik ◽  
Ana Isabel Silva ◽  
...  
Keyword(s):  
Rna Interference ◽  
Pest Management ◽  
Oilseed Rape ◽  
Growth Stages ◽  
Short Term ◽  
Pollen Beetle ◽  
Brassicogethes Aeneus ◽  
Crop Growth Stages ◽  
Insecticidal Compounds ◽  
Significant Mortality

AbstractDouble-stranded RNAs (dsRNAs) represent a promising class of biosafe insecticidal compounds. We examined the ability to induce RNA interference (RNAi) in the pollen beetle Brassicogethes aeneus via anther feeding, and compared short-term (3 d) to chronic (17 d) feeding of various concentrations of dsRNA targeting αCOP (dsαCOP). In short-term dsαCOP feeding, only the highest concentration resulted in significant reductions in B. aeneus survival; whereas in chronic dsαCOP feeding, all three concentrations resulted in significant mortality. Chronic dsαCOP feeding also resulted in significantly greater mortality compared to short-term feeding of equivalent dsαCOP concentrations. Our results have implications for the economics and development of dsRNA spray approaches for managing crop pests, in that multiple lower-concentration dsRNA spray treatments across crop growth stages may result in greater pest management efficacy, compared to single treatments using higher dsRNA concentrations. Furthermore, our results highlight the need for research into the development of RNAi cultivars for oilseed rape protection, given the enhanced RNAi efficacy resulting from chronic, compared to short-term, dsRNA feeding in B. aeneus.

scholarly journals Characterization of the pollen beetle, Brassicogethes aeneus, dispersal from woodlands to winter oilseed rape fields

PLoS ONE ◽  
2017 ◽  
Vol 12 (8) ◽  
pp. e0183878 ◽  
Author(s):  
Amandine Suzanne Juhel ◽  
Corentin Mario Barbu ◽  
Pierre Franck ◽  
Jean Roger-Estrade ◽  
Arnaud Butier ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
Winter Oilseed Rape ◽  
Pollen Beetle ◽  
Brassicogethes Aeneus

scholarly journals Biology and harmfulness of Brassica pod midge (Dasineura brassicae Winn.) in winter oilseed rape

2015 ◽  
Vol 30 (2) ◽  
pp. 85-90
Author(s):  
Draga Graora ◽  
Ivan Sivcev ◽  
Lazar Sivcev ◽  
Wolfgang Bьchs ◽  
Vladimir Tomic ◽  
...  
Keyword(s):  
Oilseed Rape ◽  
First Generation ◽  
Yield Reduction ◽  
Winter Oilseed Rape ◽  
Ceutorhynchus Assimilis ◽  
Cabbage Seed Weevil ◽  
Two Generations ◽  
Important Pest ◽  
Cabbage Seed ◽  
Dasineura Brassicae

The Brassica pod midge (Dasineura brassicae Winn.) is an important pest in oilseed rape (Brasica napus L.). It develops two generations per year and overwinters in the larval stage in cocoons in soil. Immigration of the first generation adults lasted from the beginning of April until the end of May. Larvae developed in pods from mid-April to mid-June, causing pod deformation and cracking, which resulted in premature falling out of seeds and yield reduction. Pod damage amounted to 11.6%. The emergence of the second generation adults was detected at the end of May and in the first ten days of June. D. brassicae was found to lay eggs in healthy pods and no correlation was found with the cabbage seed weevil, Ceutorhynchus assimilis Paykull.

Could Brassica rapa, Brassica juncea and Sinapis alba facilitate the control of the cabbage seed weevil in oilseed rape crops?

2013 ◽  
Vol 65 (1) ◽  
pp. 124-129 ◽  
Author(s):  
Gabriella Kovács ◽  
Riina Kaasik ◽  
Luule Metspalu ◽  
Ingrid H. Williams ◽  
Anne Luik ◽  
...  
Keyword(s):  
Brassica Juncea ◽  
Brassica Rapa ◽  
Oilseed Rape ◽  
Sinapis Alba ◽  
Cabbage Seed Weevil ◽  
Cabbage Seed

scholarly journals Spatio-temporal Distributions and Associations of Cabbage Stem Weevil (Ceutorhynchus Pallidactylus Marsham, 1802) and Pollen Beetle (Brassicogethes Aeneus Fabricius, 1775) in winter oilseed rape

2017 ◽  
Vol 65 (3) ◽  
pp. 839-847
Author(s):  
Vojtěch Hlavjenka ◽  
Marek Seidenglanz ◽  
Jaroslav Šafář
Keyword(s):  
Oilseed Rape ◽  
Cumulative Distribution ◽  
Winter Oilseed Rape ◽  
High Tendency ◽  
Pollen Beetle ◽  
Brassicogethes Aeneus ◽  
Males And Females ◽  
Spatio Temporal ◽  
The Individual ◽  
Ceutorhynchus Pallidactylus

From 2013 to 2015 the within-field spatio-temporal distributions and interactions between Ceutorhynchus pallidactylus and Brassicogethes aeneus in winter oilseed rape crops were assessed using SADIE analysis (Spatial Analysis by Distance IndicEs) and Quick association analysis. A significant tendency for aggregation was recorded in C. pallidactylus males in the crop in both 2013 and 2015. Females showed a high tendency towards aggregation only in 2013. Both sexes were significantly associated in crops in 2013 and 2015. B. aeneus adults showed a high tendency towards aggregation in all three years. From the three seasons the cumulative distributions (based on the sums of insect catches in traps for the individual dates) of males and females of C. pallidactylus were significantly associated with the cumulative distribution of B. aeneus adults only in 2013. Contrary to this, an almost significant dissociation between cumulative distributions of C. pallidactylus males and B. aeneus adults was recorded in 2014.

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