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Research Article
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Toxicity of Four Pyrethroid-based Insecticides and Kerosene to a Laboratory Population of Culex pipiens |
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Hamdy I. Hussein ,
DiefAlla Al-Rajhy
and
Mohamed Al-Assiry
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ABSTRACT
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Four commercial pyrethroid–based insecticides, cypermethrin, fenvalerate,
Killer and Tyfon super 20 were tested as larvicides against a laboratory strain
of Culex pipiens and kerosene and Tween 80 1% in kerosene were tested
as larvicides and pupicides against the same population. LC50 values
of tested pyrethroids were 0.00029 ppm (Cypermethrin), 0.026 ppm (fenvalerate),
0.012 ppm (Killer) and 0.014 ppm (Tyfon super 20). The diagnostic concentrations
for cypermethrin and Tyfon Super 20 were 0.015 and 0.07 ppm, respectively. LD50
values for larvae were 33.42 and 13.11 L ha-1 and for pupae 69.74
and 36.1 L ha-1 for kerosene and T 80 in kerosene, respectively.
The results showed that the mixture of kerosene + T 80 could be used as an effective
larvicide and pupicide at much lower rates of application compared to kerosene
alone, which reduces the environmental pollution to a great extend.
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