Document Type : Original Article
Author
Department of Applied Entomology,Faculty of Agriculture (El- Shatby)Alexandria University, Egypt.
Abstract
The present study aimed to assess and to evaluate some of the sustainable and safe measures against Culex pipiens mosquito larva that can be implemented in areas at risk of contacting elephantiasis. The joint toxic action of these control measures was also studied. Data showed that Deltamethrin (LC50=0.021ppm) was more toxic than Bacillus thurengiensis var. israelensis, diflubenzuron, emamectin benzoate and azadiractin by 2.0, 491.42, 59.0 and 143.8 fold, respectively, after 24hr. Also, after 48hr Deltamethrin (LC50 = 0.004 ppm) was 4.0, 1102.5, 25 and 232.5 times more toxic than Vectobac G, diflubenzuron, emamectin benzoate and azadiractin, respectively, after 48hr. After 72hr the toxicity of Deltamethrin (LC50=0.003 ppm) was 3.0, 206.66, 23.33, 246.66 fold more toxic than B.t.i., diflubenzuron, emamectin benzoate and azadiractin, respectively. Toxicity of Beauveria bassiana was very low compared with all the tested control measures with LC50 value 1.85ml/L after 72hr of exposure. Data of joint toxic action revealed that, all mixtures of Beauveria bassiana with diflubenzuron and all mixtures of diflubenzuron with azadiractin resulted in antagonistic effects. Approximately, all other binary mixtures resulted in potentiating effects. The highest potentiating effect was obtained when the mixture of LC12.5 B.t.i. + LC12.5 Deltamethrin was used. Finally, the use of some binary mixtures of the tested control measures can achieve better control, reduce control cost and induce lesser environmental pollution.
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