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EFFECT OF TEMPERATURE AND STAGE OF DEVELOPMENT ON SUSCEPTIBILITY OF AEDES EUEDES AND AEDES STIMULANS (DIPTERA: CULICIDAE) LARVAE TO TEMEPHOS

Published online by Cambridge University Press:  31 May 2012

B. V. Helson  and
G. A. Surgeoner
B. V. Helson
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
G. A. Surgeoner
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
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Abstract

In laboratory trials, the susceptibility of Aedes euedes Howard, Dyar and Knab and Aedes stimulans (Walker) larvae to temephos (Abate®), was positively correlated with increasing temperature. Early instar larvae were more susceptible than late instars. Susceptibility differed 36 times from the fourth instars at 4 °C (24 h LC50 = 16.92 ppb) to the first instars at 19 °C (24 h LC50 = 0.47 ppb) the extremes of instar and temperature tested. The minimum recommended dosage of temephos (6 ppb) was ca. 9 times the LC90 of first instar A. stimulans and A. euedes at 19 °C. By contrast, the 24 h LC90 of 67.4 ppb for the fourth instar of A. stimulans at 4 °C was ca. 4 times the maximum concentration of temephos (18 ppb) currently recommended for Aedes spp. control. However, in simulated pool studies, satisfactory control of A. stimulans was achieved by 72 h posttreatment at the highest recommended dosage.

Résumé

Lors d'essais en laboratoire, la susceptibilité des larves d'Aedes euedes Howard, Dyar et Knab, et d'Aedes stimulans (Walker) au temephos (Abate®) s'est avérée corrélée à la température. Les stades larvaires jeunes se sont montrés plus susceptibles que les stades âgés. La susceptibilité a varié par un facteur de 36 entre des larves de stade quatre à 40 °C (CL50 à 24 h = 16.92 ppb) et celles de stade un à 19 °C (CL50 à 24 h = 0.47 ppb), soient les extrêmes testés pour le stade et la température. Le dosage minimum recommandé (6 ppb) était d'environ 9 fois la CL90 pour le premier stade d'A. stimulans et A. euedes à 19 °C. Au contraire, la CL90 à 24 h, de 67.4 ppb pour le quatrième stade d'A. stimulans à 4 °C, était équivalente à environ 4 fois la concentration maximum de temephos (18 ppb) actuellement recommandée pour le contrôle des Aedes spp. Cependant, lors d'études en étang simulé, un contrôle satisfaisant d'A. stimulans a été obtenu par post-traitement à 72 h, à la dose maximum recommandée.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 6 , June 1983 , pp. 623 - 628
Copyright
Copyright © Entomological Society of Canada 1983

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