Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-06-20T04:44:45.011Z Has data issue: false hasContentIssue false
  • English
  • Français

Toxicity of two bacterial insecticides against the larvae of mosquito Culex pipiens and their action on the reproductive potential and morphometric characteristics of surviving females

Published online by Cambridge University Press:  19 September 2011

M. S. Saleh ,
N. L. Kelada  and
A. A. Al-Fazairy
M. S. Saleh
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
N. L. Kelada
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
A. A. Al-Fazairy
Affiliation:
Entomology Division, Faculty of Agriculture, University of Alexandria, Alexandria, Egypt
Get access

Abstract

The larvicidal activity of two entomopathogenic bacteria Bacillus thuringiensis H-14 and B. sphaericus 1593 against mosquito larvae of Culex pipiens has been evaluated. According to LC50 values obtained, B. thuringiensis (4.6 x 105 spores/ml) proved to be highly pathogenic to fourth instar larvae than fi. sphaericus (4.2 x 106 spores/ml).

Larval treatment with LC50 levels of both pathogens affected the reproductive potential of surviving adults during two successive gonotrophic cycles. These treatments caused insignificant changes in some basic morphometric characteristics of mosquito females that developed from surviving larvae.

Résumé

L'activité larvicide des deux entomopathogènes Bacillus thuringiensis H-14 et B. sphaericus 1593 a été evaluée sur les larves de Culex pipiens. D'après les valeurs de LC50 obtenues, B. thuringiensis (4.6 x 105 spores/ml) est plus pathogène sur les larves du quatrieme stade que B. sphaericus (4.2 x 106 spores/ml).

Le traitement des larves par les deux pathogènes, à un dosage correspondant a la LC50 a áffecté la reproduction des adults survivants durant deux cycles gonotrophiques successifs. Ces traitements, ont causé des changements insignifiants sur la morphologie des adultes survivants.

Keywords

Bacillus thuringiensisB. sphaericusCulex pipiensmosquito larvaemosquito femalesreproductive potentialmorphometric characteristics
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 1 , February 1987 , pp. 107 - 110
Copyright
Copyright © ICIPE 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Abu-Hashish, T. A. (1978) Morphological and biological studies in Egyptian mosquitoes under the action of synthetic pyrethroids with a new order of activity. Ph.D. thesis, Faculty of Agriculture, University of Alexandria, Egypt.Google Scholar
Al-Fazairy, A. A. (1976) Studies on certain pathogens of certain lepidopterous pests. M.Sc. thesis, Faculty of Agriculture, University of Alexandria, Egypt.Google Scholar
Davidson, E. W., Sweeney, A. W. and Cooper, R. (1981) Comparative field trials of Bacillus thuringiensis var. Israelensis commercial powder. J. Econ. Ent. 74, 350–354.CrossRefGoogle Scholar
Gaaboub, I. A. and Hayes, D. K. (1984) Biological activity of azadirachtin, a molting inhibitory component of neem, Azadirachta indica A. Juss, against the face fly, Musca autumnalis De Geer. Environ Ent. 13, 803–812.CrossRefGoogle Scholar
Ignoffo, C. M. and Gregory, B. (1972) Effects of Bacillus thuringiensis βd-exotoxin on larval development maturation, adult longevity, fecundity and egg viability in several species of lepidoptera. Environ. Ent. 1, 269–272.CrossRefGoogle Scholar
Ignoffo, C. M., Couch, T. L., Garcia, C. and Kroha, M. J. (1981) Relative activity of Bacillus thuringiensis var. Kurstaki and B. thuringiensis var israelensis against larvae of Aedes aegypti, Culex quinquefasciatus, Trichoplusia ni, Heliothis Zea, and H. virescens. J. Econ. Ent. 74, 218–222.CrossRefGoogle Scholar
Kelada, N. L., Gaaboub, I. A. and Rawash, I. A. (1981) The effect on reproduction and morphometrics of females of Culex pipiens of treatment of larvae with six insect growth regulators. J. Agric. Sci. 96, 611–618.CrossRefGoogle Scholar
Kiraly, Z., Klement, Z., Solymosy, F. and Voros, J. (1970) Methods in plant pathology with special reference to breeding for disease resistance. Akademiai Kiado, Budapest, pp. 509.Google Scholar
Lacey, L. A. and Singer, S. (1982) Larvicidal activity of new isolates of Bacillus thuringiensis H-14 against anopheline and culicine mosquitoes. Mosq. News 42, 537–543.Google Scholar
Litchfield, J. T. and Wilcoxon, E. (1949) A simplified method of evaluating dose-effect experiments. J. Phar. exp. Ther. 96, 99–113Google ScholarPubMed
McGaughey, W. H. and Kinsinger, R. A. (1978) Susceptibility of Angoumois grain moth to Bacillus thuringiensis. J. Econ. Ent. 71, 923–925.CrossRefGoogle Scholar
Mulla, M. S., Darwazeh, H. A., Davidson, E. W. and Dulmace, H. T. (1984) Efficacy and persistence of the microbial agent Bacillus sphaericus against mosquito larvae in organically enriched habitats. Mosq. News 44, 166–174.Google Scholar
Saleh, M. S. (1985a) Larvicidal activity of Bacillus thuringiensis H-14 against mosquito larvae. Insect Sci. Applic. 6, 617–620.Google Scholar
Saleh, M. S. (1985b) Effects of six insect growth regulators on mosquito larvae of Aedes aegypti. Insect Sci. Applic. 6, 609–611.Google Scholar