Persistence of Flubendiamide and Thiacloprid in/on Chilli under Middle Gujarat Condition

Following three applications of flubendiamide at 60 and 120 a.i. ha⁻¹ at 10 d interval resulted in average initial deposits of 0.22 and 0.31 mg g⁻¹ respectively. These levels gradually declined and reached below its determination limit of 0.05 μg g⁻¹ after 3 and 5 d at single and double of the recommended doses, respectively. detectable at 3^rd and 5^th d after application in lower and higher dose, respectively. Half-life (t_1/2) of flubendiamide on chilli was observed to be 1.12 and 1.76 d, at single and double dosages, respectively. Desiodo metabolite was BDL on 0 d at 60 g a.i. but its level was 0.08 mg g⁻¹ on d 1 which declined below limit of determination of 0.05 μg g⁻¹ after 3 d. At application rate of 120 a.i. ha⁻¹ desiodo metabolite was detected at the level of 0.07 and 0.08 mg g⁻¹ respectively on 0 d and 1 d and came to BDL on 3^rd d. The application of thiacloprid at 60 and 120 a.i. ha⁻¹ resulted in the residue level of 0.15 and 0.21 mg g⁻¹ respectively, one h after application. The levels gradually declined and reached below detectable at 5^th and 7^th d after application in lower and higher dose, respectively. Half-life (t_1/2) of thiacloprid on chilli was observed to be 2.17 and 2.13 d, at single and double dosages, respectively. Red chilli and soil samples collected after 20 d did not reveal the presence of flubendiamide, its metabolite desiodo and thiacloprid.