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SEX-SPECIFIC EMERGENCE OF IPS TYPOGRAPHUS L. (COLEOPTERA: SCOLYTIDAE) AND FLIGHT BEHAVIOR IN RESPONSE TO PHEROMONE SOURCES FOLLOWING HIBERNATION

Published online by Cambridge University Press:  31 May 2012

Åke Lindelöw  and
Jan Weslien
Åke Lindelöw
Affiliation:
Swedish University of Agricultural Sciences, Department of Plant and Forest Protection, Division of Forest Entomology, Box 7044, 750 07 Uppsala, Sweden
Jan Weslien
Affiliation:
Swedish University of Agricultural Sciences, Department of Plant and Forest Protection, Division of Forest Entomology, Box 7044, 750 07 Uppsala, Sweden
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Abstract

Emergence patterns, sex ratios, and dispersal characteristics of Ips typographus L. (Coleoptera: Scolytidae) emerging from hibernation sites were studied under field conditions. A total of 8666 emerging beetles were caught in 14 tent-traps, covering brood tree stumps at 3 different hibernation sites. Samples of these beetles were sexed at frequent intervals. The proportion of females increased as emergence progressed and the overall proportion of females was 62%. A total of 3433 beetles emerging after hibernation were marked and released on 19 separate occasions. The recapture rates were 13 and 4% in nearby and distant pheromone traps, respectively. Recaptures were recorded at distances of up to 1800 m. Beetles were able to respond and fly to pheromone sources shortly after emergence without prior feeding or prolonged flight activity. Trapping and marking techniques, temporal and spatial emergence patterns, seasonal sex ratio changes, and factors influencing pheromone trap catches are discussed.

Résumé

On a étudié les profils d’émergence, les ratios de femelles et les caractéristiques de la dispersion de l’Ips typographus L. (Coleoptera : Scolytidae) sortant de ses quartiers d’hivernement sur le terrain. On a capturé 8666 scolytes dans 14 pièges-tentes disposés sur des souches d’arbres colonisées, et ce à 3 sites d’hivernement. On a sexé des échantillons de scolytes à intervalles fréquents. La proportion de femelles a augmenté à mesure qu’avançait l’émergence, leur proportion globale ayant été de 62%. On a marqué et relâche 3433 scolytes ayant émergé après l’hivernement, lors de 19 sorties différentes. Les taux de recapture ont été de 13 et de 4%, avec des pièges à phéromone disposés à proximité et à distance, respectivement. On a effectué des recaptures jusqu’à 1800 m du point de relâche. Les scolytes se sont montrés attirés et capables de voler vers les sources de phéromone peu après l’émergence, sans avoir mangé ou volé de façon prolongée. La discussion porte sur le piégeage et les techniques de marquage, les profils d’émergence dans le temps et l’espace, les variations saisonnières du ratio de femelles et les facteurs qui influencent les captures par pièges à phéromone.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 1 , January 1986 , pp. 59 - 67
Copyright
Copyright © Entomological Society of Canada 1986

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