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ADULT ECLOSION OF COQUILLETTIDIA PERTURBANS (WALKER) (DIPTERA: CULICIDAE) IN MINNESOTA

Published online by Cambridge University Press:  31 May 2012

Darold P. Batzer  and
Scott R. Ranta
Darold P. Batzer
Affiliation:
Metropolitan Mosquito Control District, 2099 University Avenue West, St. Paul, Minnesota, USA 55104
Scott R. Ranta
Affiliation:
Metropolitan Mosquito Control District, 2099 University Avenue West, St. Paul, Minnesota, USA 55104
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Abstract

We monitored eclosion patterns of adult Coquillettidia perturbons (Walker) in the Minneapolis – St. Paul region of Minnesota directly using emergence traps (1983, 1984, and 1992), and indirectly using CO2-baited adult traps (1987–1992) and larval sampling (1988 and 1989). Most mosquitoes eclosed in a unimodal pulse during June although peak eclosion periods varied among years and sites. It required 26.6 ± 1.5 days for 90% of individual populations to eclose. Temporal abundances of host-seeking females also suggested unimodal eclosion with peaks typically occurring in June and July. Most larvae overwintered in the fourth instar and pupated in early summer, as expected from adult data. However, many larvae overwintered in the third instar and did not molt into the fourth until July, which was after most eclosion was completed. These individuals may eclose in autumn or may spend a second winter as larvae.

Résumé

Nous avons étudié l’émergence des adultes de Coquillettidia perturbons (Walker) dans la région de Minneapolis – St. Paul au Minnesota au moyen de pièges d’émergence (1983, 1984 et 1992) et au moyen de méthodes indirectes, la capture dans des pièges garnis de CO2 (1987–1992) et l’échantillonnage de larves (1988 et 1989). La plupart des moustiques émergent en masse en juin, mais les périodes d’émergence peuvent varier d’une année à l’autre et d’un site à l’autre. L’émergence de 90% d’une population donnée se fait en 26,6 ± 1,5 jours. La mesure temporelle de l’abondance des femelles à la recherche d’hôtes indique également une éclosion unimodale en juin ou en juillet. La plupart des larves passent l’hiver au quatrième stade et la nymphose a lieu au début de l’été, ce que laissaient d’ailleurs croire déjà les données sur les adultes. Cependant, de nombreuses larves passent l’hiver au troisième stade et n’atteignent pas le quatrième stade avant juillet, soit vers la fin de la période d’émergence. Ces individus peuvent émerger à l’automne ou passer un second hiver au stade larvaire.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 2 , April 1994 , pp. 231 - 237
Copyright
Copyright © Entomological Society of Canada 1994

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