Dissipation of Trifloxystrobin + Tebuconazole WG (Nativo 75% WG) in Pomegranate and Soil in Western Maharashtra

Results of a field experiment conducted during the year 2015 at the Seed Farm, MPKV, Rahuri, Distt. Ahmednagar to determine the residues and dissipation of Nativo 75 per cent WG (trifloxystrobin 25% + tebuconazole 50%) in/on pomegranate and soil are reported. Three sprays of Nativo 75 WG were given @ 300 and 600 g ha⁻¹ at an interval of 10 d initiating first spray at fruit setting stage. Pomegranate samples were collected at 0, 1, 3, 5, 7, 10, 15 and 20^th d after the last spray and the soil samples at harvest. The pesticide residues were analysed by using validated QuEChERS method on gas chromatography mass spectrometry. The average initial residues of trifloxystrobin in immature fruits were 0.63 and 1.45 mg kg⁻¹ and that of tebuconazole 1.11 and 2.71 mg kg⁻¹ at the single and double doses. These reached below quantification limit on 15^th and 20^th d, respectively. The half life values of trifloxystrobin were observed to be 4.17 and 4.55 d and tebuconazole, 4.11 and 4.74 d, respectively. Soil samples collected at harvest did not show any residues of trifloxystrobin, its metabolite CGA-321113 and tebuconazole at their quantification limit.