Dissipation of Profenophos, Triazophos and Acephate in/on Okra Fruits

With a view to study the dissipation of profenophos, triazophos and acephate in/on okra field experiment conducted at Regional Research station, Anand Agriculture University, Anand during Kharif 2013. The experiment was carried out in Randomized Block Design (RBD) with three replications along with a control plot. In okra, two sprays of profenophos, triazophos and acephate insecticides were applied during fruiting stage @ 500 g a.i. ha⁻¹, @ 500 g a.i. ha⁻¹ and 560 g a.i. ha⁻¹, respectively at an interval of 10 days. An untreated control was maintained for comparison. Immediately after the last application (i.e. 1hr after spray), fruit samples were drawn for 0 day. The subsequent sampling was carried out on 1^st, 3^rd, 5^th, 7^th and 10^th day. The result revealed that in okra fruit initial deposits of profenophos, triazophos and acephate were 4.472, 4.900, 5.377 μg g⁻¹ respectively, which dissipated to 1.222, 2.282 and 2.870 μg g⁻¹ within the 24 hrs. Residue of profenophos, triazophos and acephate reached BDL within 3, 5 and 7 days, respectively. Dissipation of profenophos, triazophos acephate showed monophasic first order kinetics. The Half-life value for profenophos, triazophos and acephate were 0.64, 0.74 and 1.26, respectively.