Rsidues of ryanodine receptor modulators (Diamides) chloride channels activator (Avermectin) on biological and histopathological changes of cotton leaf worm Spodoptera littoralis [electronic resource]

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Chlorantraniliprole, Flubendiamide (Diamides) and Emamectin benzoate (Avennectin derivative) belong to a recently developed class of insecticides. Diarnides disrupt ryanodine receptors while; avermectin acts as. chloride channels activator. So, the objectives of this study were to evaluate median lethal concentration for Spodoptera littoralis larvae in laboratory bioassay, to confirm field efficacy and to determine residual efficacy of these recent insecticides. In addition, the histopathoiogical changes of both muscles and mid gut of treated S. littoralis 6th larval instars were recorded. Leaves dipping technique were used in bioassay. Based on LC50 values against 4th instar larvae Coragen, under common name Chlorantraniliprole, was the most effective insecticide followed by Emox, under common name Emamectin benzoate, whereas Takumi, under common name Flubendiamide, was the last toxic insecticide, the corresponding LC50 values were 0.11, 0.29 and 0.33 ppm, respectively. All the treated larvae with LC50 values for each three tested compounds were biologically affected. Both pupation and adult emergence rates were decreased as a result of larval treatment. The larval treatment by diamide compounds had the strongest decrease on the pupal weight. Also, it was remarkable that sex ratio directed to the female side with both Coragen and Takumi while it directed to the male side with Emox.

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