What question did this study set out to answer?

The study aims to evaluate the residual toxicity of specific synthetic pyrethroids on Eutectona machaeralis.

June 8, 2026

Residual Toxicity of Some Commercial Synthetic Pyrethroids to Eutectona machaeralis (Walk.) (Lepidoptera: Pyralidae)

Key Points

The study aims to evaluate the residual toxicity of specific synthetic pyrethroids on Eutectona machaeralis.
Evaluated cypermethrin, deltamethrin, and fenvalerate under controlled laboratory conditions.
Measured residual toxicity using LT50 values at specified spray concentrations.
Compared the effectiveness of each insecticide against the teak skeletonizer.
Cypermethrin demonstrated the highest residual toxicity with an LT50 of 17.20 days.
Fenvalerate had an LT50 of 13.04 days.
Deltamethrin showed the lowest residual toxicity with an LT50 of 11.89 days.

Abstract

Cypermethrin (25 e.c.), deltamethrin (2.8 e.c.) and fenvalerate (20 e.c.) were evaluated for their residual toxicity against E. machaeralis (Walk.) under laboratory conditions. Based on LT 50 values e.c. formulations of cypermethrin showed significantly higher residual toxicity to teak skeletonizer, E. machaeralis (Walk.) than that of deltamethrin and fenvalerate. The LT 50 values of these insecticides at 0.075, 0.075 and 0.06 per cent spray concentrations were found in descending order, 17.20 days (cypermethrin), 13.04 days (fenvalerate) and 11.89 days (deltamethrin).

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