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  • Thomas H. Lillie (a1), William C. Marquardt (a1) and Robert H. Jones (a1)

The flight range of Culicoides variipennis was studied in a bluetongue virus enzootic area during the summer of 1977. Field-collected larvae and pupae were reared to the adult stage in a field laboratory. Approximately 82,200 flies were marked with micronized fluorescent dusts and released and 403 were recaptured in CO2-baited baffle traps. The maximum distance traveled was 0.8 km by a male and 4.0 km by a female. One female was recovered on the release night 2.8 km from the release point. The mean distance traveled (MDT) was 0.8 km on the release night, 2.02 km on one night postrelease, and 2.11 km on two nights postrelease. The MDT for all flies recovered up to eight nights postrelease was 1.89 km.

Based on the overall MDT of 1.89 km, the transmission of a disease agent by C. variipennis becomes theoretically possible if the host population density is greater than one per 3.57 km2. The probability of transmission can be significantly reduced if a 3.57 km2 area surrounding a single C. variipennis breeding site is treated with an effective insecticide.

Le rayon d’action de Culicoides variipennis en vol a été étudié dans un secteur enzootique du virus de la fièvre catarrhale du mouton durant l’été 1977. Des larves et pupes collectionnées sur le terrain ont été élevées jusqu’au stade adulte dans un laboratoire de terrain. Environ 82,000 brûlots ont été marqués à l’aide de poussière fluorescente micronisée, et relâchés, et 403 ont été recapturés à l’aide de pièges à impact appâtés au CO2. La distance maximum parcourue a été de 0.8 km par un mâle, et 4.0 km par une femelle. Une femelle a été retrouvée à 2.8 km du site de relâchage, la nuit même du relâchage. La distance moyenne parcourue (DMP) a été de 0.8 km la nuit du relâchage, 2.02 km la première nuit postérieure au relâchage, et de 2.11 km la deuxième nuit. La DMP pour tous les brûlots recapturés jusqu’à 8 nuits postérieures au relâchage a été de 1.89 km.

Sur la base de la DMP globale de 1.89 km, la transmission du pathogène par C. variipennis est théoriquement possible, si la densité de population de l’hôte est supérieure à un par 3.57 km2. La probabilité de transmission peut être significativement réduite par le traitement des 3.57 km2 de surface couvrant le site de reproduction d’un seul C. variipennis à l’aide d’un insecticide efficace.

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The Canadian Entomologist
  • ISSN: 0008-347X
  • EISSN: 1918-3240
  • URL: /core/journals/canadian-entomologist
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