Laboratory and field-based tests of deltamethrin insecticides against adult Culicoides biting midges

Venail Roger, Mathieu Bruno, Setier-Rio Marie-Laure, Borba C., Alexandre Mathilde, Viudes G., Garros Claire, Allene Xavier, Carpenter Simon, Baldet Thierry, Balenghien Thomas. 2011. Laboratory and field-based tests of deltamethrin insecticides against adult Culicoides biting midges. Journal of Medical Entomology, 48 (2) : 351-357.

Quartile : Q1, Sujet : VETERINARY SCIENCES / Quartile : Q1, Sujet : ENTOMOLOGY

Résumé : Bluetongue virus (BTV) is an economically important arbovirus of ruminants transmitted by Culicoides biting midges. Vector control using residual spraying or application to livestock is recommended by many authorities to reduce BTV transmission; however, the impact of these measures in terms of both inflicting mortality on Culicoides and subsequently upon BTV transmission is unclear. This study consisted of a standardized World Health Organization laboratory assay to determine the susceptibility of European Culicoides species to deltamethrin and a field trial based upon allowing individuals of a laboratory strain of Culicoides nubeculosus Meigen to feed upon sheep treated with Butox 7.5 pour-on (a deltamethrin-based topical formulation). Susceptibility in the laboratory trial was higher in colony C. nubeculosus (24-h LC [90]=0.00106%), than in field populations of Culicoides obsoletus Meigen (24-h LC[90]=0.00203%) or Culicoides imicola Kieffer (24-h LC[90]=0.00773%). In the field, the pour-on formulation was tested with a total of 816 C. nubeculosus specimens fed upon on the thigh of treated sheep. The study revealed a maximum mortality rate of 49% at 4 d post application, and duration of lethal effect was predicted to be as short as 10 d, despite testing being carried out with a highly susceptible strain. The reasons for this low efficacy are discussed with reference both to the potential for lack of spread of the active ingredient on the host and feeding patterns of the major potential vector species on the sheep host. Practical implications for vector control strategies during BTV incursions are also detailed.

Mots-clés Agrovoc : Culicoides, Culicoides nubeculosus, virus bluetongue, ovin, deltaméthrine

Mots-clés géographiques Agrovoc : Europe

Mots-clés complémentaires : Culicoides obseletus, Culicoides imicola

Classification Agris : L72 - Organismes nuisibles des animaux
L73 - Maladies des animaux

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

• Venail Roger, EID (FRA)
• Mathieu Bruno, EID (FRA)
• Setier-Rio Marie-Laure, EID (FRA)
• Borba C., EID (FRA)
• Alexandre Mathilde, Fédération régionale de groupements de défense sanitaire du Languedoc-Roussillon (FRA)
• Viudes G., CIRAD-PERSYST-UMR ERRC (FRA)
• Garros Claire, CIRAD-BIOS-UMR CMAEE (FRA) ORCID: 0000-0003-4378-5031
• Allene Xavier, CIRAD-BIOS-UMR CMAEE (FRA)
• Carpenter Simon, Institute for Animal Health (GBR)
• Baldet Thierry, CIRAD-BIOS-UMR CMAEE (BEN) ORCID: 0000-0003-2979-9517
• Balenghien Thomas, CIRAD-BIOS-UMR CMAEE (FRA) ORCID: 0009-0008-4495-4814

Source : Cirad - Agritrop (https://agritrop.cirad.fr/559397/)

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