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Determination of Toxicity of various Groups of Insecticides Against Different Larval Stages of Lemon Butterfly, Papilio demoleus (Linn.)

Author: Yogendra Pal Singh and Ramakant

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Abstract

The relative toxicity of three groups of insecticides, synthetic pyrethroids, organochlorin and organophosphate, against the 1st, 3rd and 5th instar caterpillars of P. demoleus (Linn), a serious pest on citrus plants were studied. The lethal concentrations (LC50) were worked out by dry film method using Aceton AR as solvent. Synthetic pyrethroids gave much lower LC50 values as compared to Organophosphate and Organochlorine groups of insecticides. In present study Deltamethrin proved the most toxic insecticide against the all stages of tested caterpillars fallowed by other insecticides. Monocrotophos was least toxic against all stages larvae Papilio demoleus. The Endosufan was intermediate in toxicity against the tested insect larvae. The study of used insecticides may be promising in the population suppression of Papilio caterpillars infestation on citrus orchards hence an urgent and effective control measures need to introduce against this pest to secure the citrus fruits. For safe and superior quality and quantity of citrus production, an appropriate controlling strategy and proper pest management applications are recommended.

Keywords

Insecticides, pest, citrus, toxicity, Papilio demoleus, caterpillars, larvae. LC50

Conclusion

From the present study, it can be concluded that the values of LC50 of tested insecticides were gradually increased with growth of insect larval stage which was least at 1st instar stage and higher at last stage larvae. The relationship between insecticides of synthetic pyrethroids, organochlorine and organophosphate groups is represented as Synthetic pyrethroids > Organochlorine > Organophosphate.

References

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How to cite this article

Yogendra Pal Singh and Ramakant (2023). Determination of Toxicity of various Groups of Insecticides Against Different Larval Stages of Lemon Butterfly, Papilio demoleus (Linn.). Biological Forum – An International Journal, 15(4): 487-492.