Residual and decontamination study on reduction of pre-mix formulation action-505 EC in Okra

Abstract

To check the residue and decontamination status in okra crop treated with pre-mix insecticide [5% cypermethrin + 50% Chlorpyriphos]. Samples were gathered at regular interval after spray of insecticide at 275 g a.i.ha-1 (Suggested dose) and 550 g a.i.ha-1 (double the suggested dose) from the field of entomology. Residues were analysed by GC-ECD and confirmed by GC-MS. Residue half-life values were 2.74 days and 3.07 days at suggested dose and double the suggested dose for cypermethrin in pre-mix while were 2.16 days and 3.27 days for chlorpyriphos in pre-mix formulation. In household units boiling after washing found much effective in reducing the residues.