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INDUCTION OF DIAPAUSE IN CULEX PIPIENS AND CULEX RESTUANS (DIPTERA: CULICIDAE) IN SOUTHERN ONTARIO

  • D. J. Madder (a1), G. A. Surgeoner (a1) and B. V. Helson (a1)
Abstract

Culex pipiens entered diapause in early July with more than 90% in diapause by mid-August. Onset of diapause in Culex restuans was in early July with greater than 80% in diapause by late July. The incidence of diapause in C. pipiens increased when larvae were reared at low temperatures or high densities under similar photoperiod conditions. Diapausing adult females of C. pipiens and C. restuans had ratios of follicle:germarium length of less than 2.00:1.00. Ovarioles of recently emerged diapausing C. pipiens developed to the nondiapause stage in 3–4 weeks when held at 25 °C and a photoperiod of 16L:8D. Ovarioles of diapausing C. pipiens in the field did not develop to the nondiapause state before females left their overwintering sites in the spring.

Culex pipiens est entré en diapause en juillet, et l'incidence de diapause atteignait 90% à la mi-août. Chez Culex restuans la diapause a commencé tôt en juillet, ayant atteint plus de 80% d'incidence tard en juillet. L'incidence de diapause chez C. pipiens a augmenté lorsque les larves ont été élevées à basse température ou à haute densité, sans changement de photopériode. Chez les femelles diapausantes de C. pipiens et de C. restuans, le rapport de longueur follicule : germarium était inférieur à 2.00 : 1.00. Les ovarioles de femelles diapausantes de C. pipiens récemment émergées se sont développées jusqu'en phase non-diapausante en l'espace de 3 à 4 semaines à 25 °C et sous une photopériode de 16L : 8N. Sur le terrain, les ovarioles de C. pipiens en diapause n'ont pas atteint le stade non-diapausant avant d'avoir quitté les sites d'hivernement au printemps.

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