Toxicity properties of Lemongrass Essential Oil against Brinjal Hadda Beetle, Henosepilachna vigintioctapunctata (Fabricius)

Author: Manikandan R. and Ayyasamy R.

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Abstract

A laboratory experiment was conducted out at the toxicology and seaweed laboratory of Department of Entomology, Annamalai University, Chidambaram during the academic year 2021-2022 to study the impacts of lemongrass essential oil against brinjal hadda beetle. Early infestation of the brinjal crop by the hadda beetle and its grub stages results in economic losses. Due to its polyphagous nature, it also treats other medicinal and solanaceous crops. Lemongrass essential oil was widely exploited for urban pest management in various formulations. In our current study, five different concentrations of lemongrass essential oil were tested with standard checks of neem oil 2 per cent, cypermethrin 25EC and distilled water. The results showed that the values of LC50 and mortality per cent in laboratory circumstances, the dry film residue bioassay showed substantially higher values than the leaf dip bioassay and fumigant bioassay. The bioassays of lemongrass essential oil @ 5 per cent were much effective to brinjal hadda beetle and third instar grub than neem oil @ 2 per cent and also it provided the same or more promising results of cypermethrin 25EC @ 0.04%. Therefore, it might be a promising management approach at the semi-field and field levels as well as a green pesticide for pest management.

Keywords

Pest management, Fumigation method, Leaf dip method, Dry film method, Neem oil, Laboratory Bioassay

Conclusion

Lemongrass essential oil also has antifeedant and repelling qualities, in addition to exhibiting insecticidal qualities against hadda beetle grubs and adults. It had a number of secondary metabolites that affected these characteristics. According to the statistical analysis, lemongrass essential oil at 5 @ is more effective as a repellent and a protector of the leaf area. The insecticidal properties of 5 per cent lemongrass essential oil and cypermethrin 25EC were identical in action but took more time than chemical.

References

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How to cite this article

Manikandan R. and Ayyasamy R. (2023). Toxicity properties of Lemongrass Essential Oil Against Brinjal Hadda Beetle, Henosepilachna vigintioctapunctata (Fabricius). Biological Forum – An International Journal, 15(6): 275-280.