Dissipation of Acetamiprid Residues in Okra Fruits and Red Soil of West Benga

Abstract

The residual fate and dissipation pattern of acetamiprid 20 per cent SP on okra fruits and soil in red and lateritic belt of the Indian sub-continent are reported. The insecticide was applied at the recommended (T1 ) 15 g a.i. ha–1 and double the recommended (T2 ) 30 g a.i. ha–1 doses along with an untreated control (T3 ) for two consecutive seasons (Rabi 2015-16 and Rabi 2016-17). The field cropped soil and fruits were collected at different time intervals. The half-life values were found in the range of 14.76 to 23.34 d in okra cropped soil and 0.87 to 1.46 d in okra fruits, irrespective of the dose and season. More than 65 per cent of acetamiprid dissipated after 45 d of application on cropped soil and more than 90 per cent in fruits after 5 d of application. This insecticide could safely be recommended for application as no residues were detected after 7 d of application in okra fruits.