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Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii

The rapid invasion of Drosophila suzukii (Matsumura) throughout Europe and the Americas has led to an increased reliance on calendar-based broad-spectrum insecticide programs among berry and cherry growers. Relatively few active ingredients (AIs) are currently available for effective D. suzukii mana...

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Autores principales: Gress, Brian E., Zalom, Frank G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9242520/
https://www.ncbi.nlm.nih.gov/pubmed/35767598
http://dx.doi.org/10.1371/journal.pone.0270747
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author Gress, Brian E.
Zalom, Frank G.
author_facet Gress, Brian E.
Zalom, Frank G.
author_sort Gress, Brian E.
collection PubMed
description The rapid invasion of Drosophila suzukii (Matsumura) throughout Europe and the Americas has led to an increased reliance on calendar-based broad-spectrum insecticide programs among berry and cherry growers. Relatively few active ingredients (AIs) are currently available for effective D. suzukii management, and studies from multiple growing regions indicate that susceptibility to at least some of these materials is declining. Greater effort is needed to understand the status of susceptibility across field populations and the potential for increased resistance to develop, as well as the possible fitness costs incurred by resistant individuals. However, current bioassay protocols used for resistance monitoring and selection studies (i.e. resistance risk assessments) are labor-intensive and costly, making large-scale studies difficult to conduct. Here, we first present a novel bioassay protocol using larvae that requires little effort or cost to implement beyond what is needed for basic D. suzukii laboratory colony maintenance. We then perform dose-response bioassays using this protocol to identify larval lethal concentrations for three commonly used insecticides (malathion, spinosad and zeta-cypermethrin) in a susceptible population. Finally, resistance risk assessments were conducted using a population of D. suzukii from commercial caneberry fields near Watsonville, CA. We find that five generations of larval selection with a discriminating dose is sufficient to significantly increase both larval (malathion and spinosad) and adult (spinosad) resistance to the target AIs. This approach provides a simple, cost-effective tool for assaying susceptibility of D. suzukii populations to insecticides and for selecting resistant insect lines for resistance management research.
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spelling pubmed-92425202022-06-30 Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii Gress, Brian E. Zalom, Frank G. PLoS One Research Article The rapid invasion of Drosophila suzukii (Matsumura) throughout Europe and the Americas has led to an increased reliance on calendar-based broad-spectrum insecticide programs among berry and cherry growers. Relatively few active ingredients (AIs) are currently available for effective D. suzukii management, and studies from multiple growing regions indicate that susceptibility to at least some of these materials is declining. Greater effort is needed to understand the status of susceptibility across field populations and the potential for increased resistance to develop, as well as the possible fitness costs incurred by resistant individuals. However, current bioassay protocols used for resistance monitoring and selection studies (i.e. resistance risk assessments) are labor-intensive and costly, making large-scale studies difficult to conduct. Here, we first present a novel bioassay protocol using larvae that requires little effort or cost to implement beyond what is needed for basic D. suzukii laboratory colony maintenance. We then perform dose-response bioassays using this protocol to identify larval lethal concentrations for three commonly used insecticides (malathion, spinosad and zeta-cypermethrin) in a susceptible population. Finally, resistance risk assessments were conducted using a population of D. suzukii from commercial caneberry fields near Watsonville, CA. We find that five generations of larval selection with a discriminating dose is sufficient to significantly increase both larval (malathion and spinosad) and adult (spinosad) resistance to the target AIs. This approach provides a simple, cost-effective tool for assaying susceptibility of D. suzukii populations to insecticides and for selecting resistant insect lines for resistance management research. Public Library of Science 2022-06-29 /pmc/articles/PMC9242520/ /pubmed/35767598 http://dx.doi.org/10.1371/journal.pone.0270747 Text en © 2022 Gress, Zalom https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Gress, Brian E.
Zalom, Frank G.
Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii
title Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii
title_full Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii
title_fullStr Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii
title_full_unstemmed Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii
title_short Development and validation of a larval bioassay and selection protocol for insecticide resistance in Drosophila suzukii
title_sort development and validation of a larval bioassay and selection protocol for insecticide resistance in drosophila suzukii
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9242520/
https://www.ncbi.nlm.nih.gov/pubmed/35767598
http://dx.doi.org/10.1371/journal.pone.0270747
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