Laboratory Evaluation of Toxicity of Insecticide Formulations from Different Classes against American Cockroach (Dictyoptera: Blattidae)
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Abstract
Background: The present study was designed to investigate the insecticidal efficacy of four different classes of in-secticides: pyrethroids, organophosphates, phenyl-pyrazoles and neo-nicotenoids. One representative chemical from each class was selected to compare the toxicity: deltamethrin from pyrethroids, Dichlorovinyl Dimethyl Phosphate (DDVP) from organophosphates, fipronil from phenyl-pyrazoles and imidacloprid from neo-nicotenoids. The objec- tive of this study was to determine which of these insecticides were most effective against American cockroach.
Methods: These insecticides were tested for their LC50 values against Periplaneta americana under topical bioassay method, using different concentrations for each chemical.
Results: Fipronil 2.5% EC was highly effective at all concentrations applied, while DDVP 50% EC was least toxic amongst all. One way analysis of variance confirmed significant differences between mortality of P. americana and different concentrations applied (P< 0.05).
Conclusion: Locality differentiation is an important factor in determining the range of resistance between various localities, as all three localities behaved differently in terms of their levels of resistance.
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| Issue | Vol 8 No 1 (2014) | |
| Section | Articles | |
| Keywords | ||
| Efficacy Insecticides Periplaneta americana Resistance Topical bioassay | ||
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