Comparative persistence of flubendiamide residues in chilli following application as individual and combination formulation

Abstract

Introduction Chilli, an important crop of India, is infested by various insect pests during its cultivation. A new insecticide flubendiamide is being registered in India individually as well as in combinationwith thiacloprid for use against lepidopteran and sucking pests of chilli. Objectives To study the dissipation pattern of flubendiamide following its application as flubendiamide alone and in combination with thiacloprid. Methods Standardized methodologies using high-performance liquid chromatography, were adopted to estimate residues of flubendiamide, its metabolite, des-iodo flubendiamide and thiacloprid in chilli. Results Average initial deposits of flubendiamide in chilli following its application as flubendiamide alone or as flubendiamide and thiacloprid combination were almost the same, i.e. 0.467 and 0.499mgkg � 1 , respectively, from treatment at recommended dose of 60ga.i.ha � 1 , 0.824 and 0.992mgkg � 1 from treatment at double the recommended dose. Residues dissipated to below detectable levels within 7‐10 days, respectively. Des-iodo flubendiamide, a metabolite of flubendiamide was not detected in any of the chilli samples collected at different time intervals. Residues of thiacloprid also dissipated quickly and were below quantifiable level of 0.01mgkg � 1 at 7 and 10 days, respectively. Conclusion Flubendiamide residues behaved in almost identical manner when applied alone or in combination with thiacloprid. SHARMA D, MOHAPATRA S, AHUJA AK, DIVAKAR JV, DEEPA M (2011). Comparative persistence of flubendiamide residues in chilli following application as individual and combination formulation. Quality Assurance and Safety of Crops & Foods, 3, 69‐73.