Residues of Combination Product of Flubendiamide 24%+ Thiacloprid (24%) (480 SC) in Immature (green) and Mature pods of Red Gram and its Risk Assessment

Foliar application of a combination product of flubendiamide + thiacloprid on redgram @ 48 + 48 and 96 + 96 g a.i. ha⁻¹ on red gram provided initial deposits of flubendiamide at 0.062 and 0.108 mg kg⁻¹ at standard and double dose, respectively in the immature grains which reached below determination limit on the 1^st day after application. At harvest, the residues were below determination limit (BDL) in matured pods (grains) and soil. Thiacloprid dissipated at a slower rate with initial deposits of 0.179 and 0.251 mg kg⁻¹ in the immature grains which reached BDL on the 10^th and 20^th days at the standard and the double dose, respectively. The dissipation of the residues for both the doses was biphasic. Residues in standard dose followed 1^st order kinetics during first 24 hours and dissipated with half-life of 0.73 day whereas from 3^rd day onwards the residues dissipated with half-life of 13.68 days. The residues in double dose also followed 1^st order kinetics during first 24 hours and dissipated with half-life of 0.77 day whereas from 3^rd day onwards the residues dissipated with half-life of 18.81 days. At harvest, the residues were below determination limit in matured pods and soil. Theoretical maximum dietary intake (TMDI) of flubendiamide and thiacloprid was 0.036 and 0.086% of their maximum permissible intake (MPI), respectively. Thus the application of combination product of flubendiamide and thiacloprid does not pose health risk and is safe for use on red gram.