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EFFICACY OF BACILLUS SPHAERICUS STRAIN 1593 AGAINST THE FOUR INSTARS OF LABORATORY REARED AND FIELD COLLECTED CULEX PIPIENS PIPIENS AND LABORATORY REARED CULEX SALINARIUS1

  • Stephen P. Wraight (a1), Daniel Molloy (a1) and Hugo Jamnback (a1)

Abstract

Culex pipiens pipiens and C. salinarius were found equally susceptible in laboratory tests to Bacillus sphaericus strain 1593 with LC50 values for the four instars ranging between 20 and 137 ppb (approximately 820 and 5600 spores/ml). Tests against field collected C. p. pipiens larvae revealed a regularly decreasing susceptibility with increasing larval age, the first instars being between 2 and 5 times more susceptible than fourth instars. In contrast, no significant differences in the susceptibility of second, third, and fourth instars were found in tests of laboratory reared larvae.

Lors d’essais de laboratoires Culex pipiens pipiens et C. salinarius se sont montrés également susceptibles au Bacillus sphaericus souche 1593, les valeurs de la CL50 pour les 4 stades se situant entre 20 et 137 ppb (environ 820 et 5600 spores/ml). Des essais sur des larves de C. p. pipiens provenant du terrain ont révélé une susceptibilité décroissant régulièrement d’un stade au suivant, les premiers stades étant de 2 à 5 fois plus susceptibles que les quatrièmes stades. Cependant aucune différence significative de susceptibilité n’a été observée pour les stades deux, trois et quatre, chez des larves élevées en laboratoire.

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References

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