Effects of insecticidal seed treatments and foliar sprays in winter oilseed rape in autumn on insect pests and TuYV infection

Conrad, Nils; Brandes, Meike; Will, Torsten; Verreet, Joseph‐Alexander; Ulber, B.; Heimbach, Udo

doi:10.1007/s41348-018-0173-5

Cited by 4 publications

(10 citation statements)

References 6 publications

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“…If immigration started after the 20th September, the threshold would go up to 20 beetles/m . A correlation between yellow water trap catches and larval density was shown by Green (2008) and Conrad (2019). These findings can be used for a more targeted insecticide application and control of adult P. chrysocephala, to avoid larval damage.…”

Section: Discussionmentioning

confidence: 78%

“…For cabbage stem flea beetle, a threshold based on the number of adult beetles per m 2 might be used to avoid critical infestation levels of more than 4 larvae per plant before winter. In commercial crops of oilseed rape, Conrad (2019) found a high correlation between the beetle density per m 2 and yellow water trap catches (r = 82%) but this was not significant. Our experiments have shown, that up to a density of 13 beetles/m 2 no insecticide treatment is required if adult immigration started before the 20th of September.…”

Section: Discussionmentioning

confidence: 82%

“…The results of these semi-field experiments were confirmed by results of a corresponding field experiments which were carried out during the same years in open field conditions near the trial area. These trials were conducted within the same project and targeted to answer the same questions (for more information see Conrad 2019). These open field insecticide efficacy trials and similar net cage trials showed that the results of the net cage experiments are applicable also for open field conditions, although it can be assumed that there are small deviations from the open field conditions caused by a different microclimate within the net cages.…”

Section: Discussionmentioning

confidence: 99%

“…Different temperature regimes in the three years of study showed clear effects on the abundance of larvae, which was linked to the respective temperature sums. At higher temperatures in the year 2015/16, both the higher number of larvae per plant and the advanced larval instars before winter resulted in an increased risk of plant damage (for detailed larval age structure see Conrad 2019). Larvae of the 2nd and 3rd instar tend to consume more plant tissue compared to the 1st instar larvae, resulting in a higher damage potential.…”

Section: Discussionmentioning

confidence: 99%

“…The cabbage stem flea beetle, Psylliodes chrysocephala L. (Coleoptera: Chrysomelidae), is one of the most important autumn pests in winter oilseed rape (Brassica napus L.) (Nilsson 2002;Alford et al 2003). The adult beetles immigrate to the fields between beginning of September and end of October (Hoßfeld 1993;Johnen and Meier 2000;Conrad 2019). The females need a maturity feeding of at least 2-3 weeks before they start to deposit their eggs into the soil (Mathiasen et al 2015b).…”

Section: Introductionmentioning

confidence: 99%

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Effect of immigration time and beetle density on development of the cabbage stem flea beetle, (Psylliodes chrysocephala L.) and damage potential in winter oilseed rape

Conrad¹,

Brandes

Ulber

et al. 2021

J Plant Dis Prot

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In a semi-field net cage experiment set up in three growing seasons (2015–2018) at Julius-Kühn Institute Braunschweig, Germany, the influence of different release times of adult cabbage stem flea beetles, Psylliodes chrysocephala (early September, mid-September, early October) and different beetle densities (6.7, 13.3 and 20 beetles/m2) on reproduction and damage potential in winter oil seed rape was investigated. In parallel to the cage trials, the number of deposited eggs was assessed in small boxes exposed in the field. Beetles released in early September laid significantly more eggs compared to beetles released early October, with a maximum of 270 eggs per female. The early release of beetles resulted in significantly higher numbers of larvae in autumn, but this differed significantly between the years. Warm autumn or winter conditions led to continued egg laying and development, whereas cold conditions stopped the reproduction. Significant yield losses (25%) and significant plant losses during winter were only found in 2016/17 in treatments with an early release of high numbers of beetles (20 beetles /m2). The German damage threshold of 3–5 larvae per plant was reached when 13 beetles/m2 were released before 20th September and 20 beetles per m2 after 20th September. Data of this study can be used for a better damage prediction and a more targeted beetle control.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of immigration time and beetle density on development of the cabbage stem flea beetle, (Psylliodes chrysocephala L.) and damage potential in winter oilseed rape

Conrad¹,

Brandes

Ulber

et al. 2021

J Plant Dis Prot

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Consequences of the neonicotinoid seed treatment ban on oilseed rape production – what can be learnt from the Swedish experience?

Lundin

2021

Pest Management Science

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There has been great concern about negative effects on crop production resulting from the ban on insecticide seed treatments containing neonicotinoids. I examine how the neonicotinoid ban has affected crop protection and crop production in oilseed rape (Brassica napus L.) using Sweden as a case study and compare the Swedish situation with that in leading countries growing winter and spring oilseed rape, respectively. The cropping area of winter and spring oilseed rape in Sweden has increased by approximately 40% to around 100 000 ha and decreased by approximately 90% to around 4000 ha, respectively following the ban and there are trends for increased pest and disease pressure. Overall, however, the ban has not had any major impacts on total oilseed rape cropping area or crop yields per hectare of either winter or spring oilseed rape, which is in contrast to elsewhere in Europe. In Germany and the United Kingdom, for example, the cropping area has decreased following the ban on neonicotinoid seed treatments, attributed to increased insect pest pressure especially from cabbage stem flea beetle, Psylliodes chrysocephala. I conclude that winter oilseed rape has remained a viable crop to grow in Sweden without insecticide seed treatments, but that further investments into integrated pest management are needed for sustainable insect pest control in oilseed rape in the future. © 2021 The Author. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Entwicklungen des Insektizid-Einsatzes in Winterraps (Brassica napus L.) infolge des Anwendungsverbotes neonicotinoider Beizen

Andert

Ziesemer

2021

Gesunde Pflanzen

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ZusammenfassungDer Anbau von Winterraps (Brassica napus L.) wird durch das Auftreten tierischer Schaderreger begleitet, wodurch ein intensiver Insektizid-Einsatz nötig ist. Insbesondere das Anwendungsverbot neonicotinoider Beizen in Winterraps schränkt jedoch die Möglichkeiten der Insektenbekämpfung für landwirtschaftliche Betriebe in der Europäischen Union (EU) ein. Die vorliegende Studie untersucht den Insektizid-Einsatz landwirtschaftlicher Praxisbetriebe, um die Auswirkungen des Anwendungsverbotes neonicotinoider Beizen in Deutschland zu identifizieren. Die feldspezifischen Anbau- und Insektizid-Daten der Referenzbetriebe Mecklenburg-Vorpommern ermöglichen eine detaillierte Analyse des Insektizid-Einsatzes und einen Vergleich der Anwendungsmuster von Insektiziden im Zeitraum der Zulassung neonicotinoider Beizen (2012–2014) und dem darauffolgenden Zeitraum seit dem Anwendungsverbot (2015–2019). Als Maßzahlen für die Insektizid-Intensität werden der Behandlungsindex (BI) und die Anzahl der Überfahrten mit Insektiziden ausgewertet. Die Ergebnisse belegen einen signifikanten Anstieg des Insektizid-Einsatzes in Winterraps im Zeitverlauf 2012–2019. Die mittlere Insektizid-Intensität der Flächenapplikationen ist infolge des Anwendungsverbotes neonicotinoider Beizen um 22,5 % angestiegen. Die Anzahl der Überfahrten mit Insektiziden ist um 1,1 erhöht, dies entspricht einer zusätzlichen Überfahrt mit Insektiziden mit der maximal zugelassenen Aufwandmenge. In der Auflaufphase und den frühen Entwicklungsstadien der Pflanzen (Herbst) hat sich die Insektizid-Intensität vervierfacht. Saattermine und Saatstärken variieren zwischen den Erhebungsjahren, zeitliche Verschiebungen des Saattermins oder eine Anpassung der Saatstärke infolge des Anwendungsverbots neonicotinoider Beizen wurden jedoch nicht identifiziert. 41 % der Referenzbetriebe Mecklenburg-Vorpommern setzten die insektizide Beize Lumiposa 625 FS (Wirkstoff Chlorantraniliprole) im Betrachtungszeitraum 2017–2019 ein. Der Einsatz der Beize ist von 2017–2019 angestiegen und variiert zwischen den Betrieben. Die aktuelle Zulassung der insektiziden Beize Lumiposa 625 FS in Deutschland wird vermutlich zum stärkeren Einsatz führen.

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Effects of insecticidal seed treatments and foliar sprays in winter oilseed rape in autumn on insect pests and TuYV infection

Cited by 4 publications

References 6 publications

Effect of immigration time and beetle density on development of the cabbage stem flea beetle, (Psylliodes chrysocephala L.) and damage potential in winter oilseed rape

Effect of immigration time and beetle density on development of the cabbage stem flea beetle, (Psylliodes chrysocephala L.) and damage potential in winter oilseed rape

Consequences of the neonicotinoid seed treatment ban on oilseed rape production – what can be learnt from the Swedish experience?

Entwicklungen des Insektizid-Einsatzes in Winterraps (Brassica napus L.) infolge des Anwendungsverbotes neonicotinoider Beizen

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