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EFFECTS OF ECDYSONES, JUVENILE HORMONE ANALOGS, AND 6-OXOOCTANOIC ACID ON THE DEVELOPMENT OF THE MOSQUITO, CULEX TARSALIS (DIPTERA: CULICIDAE)12

Published online by Cambridge University Press:  31 May 2012

P. I. Ittycheriah ,
M. S. Quraishi  and
E. P. Marks
P. I. Ittycheriah
Affiliation:
Department of Entomology, North Dakota State University, Fargo and Metabolism and Radiation Research Laboratory, Agricultural Research Service, Fargo
M. S. Quraishi
Affiliation:
Department of Entomology, North Dakota State University, Fargo and Metabolism and Radiation Research Laboratory, Agricultural Research Service, Fargo
E. P. Marks
Affiliation:
Department of Entomology, North Dakota State University, Fargo and Metabolism and Radiation Research Laboratory, Agricultural Research Service, Fargo
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Abstract

Eggs, larvae, and pupae of Culex tarsalis Coquillett were treated with ecdysones, juvenile hormone analogs, and 6-oxooctanoic acid. Effects of these agents on mortality, induction of supernumerary stages, and adult emergence were determined. Topical treatment of eggs with CRD9499 (a juvenile hormone analog), β-ecdysone, and 22-isoecdysone caused a reduction in adult emergence. Treatment of fourth-instar larvae with these chemicals not only induced mortality but also caused the formation of supernumerary intermediate stages. Larvae of C. tarsalis were very susceptible to CRD9499, but pupae were resistant. The ecdysones caused some mortality but only at very high doses and would thus be of little use as larvicides. 6-Oxooctanoic acid caused high rates of mortality at 0.001 M concentrations.

Type
Articles
Information
The Canadian Entomologist , Volume 106 , Issue 1 , January 1974 , pp. 79 - 85
Copyright
Copyright © Entomological Society of Canada 1974

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