Generation of residue data from supervised residue trials for Maximum Residue Limit (MRL) setting of tebuconazole and trifloxystrobin on dragon fruits

Ngan, C. K.^1*, Nor Hasimah, H.², Nurhafiza, H.² and Mohammad Nazrul Fahmi, A. R.³

Abstract
Four residue field trials of fungicide application (trade name: Nativo, containing active ingredients of tebuconazole and trifloxystrobin) on dragon fruits were conducted in Peninsular Malaysia within 2015 – 2016 period. Three foliar applications of Nativo at were made at 240 g/ha of Nativo with retreatment period of 7 days. The first application was made 2 – 3 weeks before predicted harvest. Dragon fruit samples were collected at 0, 1, 3, 7 and 14 DALA (Days After Last Application) of Nativo. In analytical phase, tebuconazole, trifloxystrobin and trifloxystrobin acids were analysed in samples in accordance to residue definition in term of Maximum Residue Limit (MRL) compliance and dietary risk assessment. In all the four residue field trials, tebuconazole, trifloxystrobin and trifloxystrobin acids were detected in dragon fruit (whole fruit) in the range of <0.01 – 0.353 mg/kg, <0.04 – 0.327 mg/kg and <0.01 – 0.014 mg/kg, respectively. Based on the residue data and selected pre-harvest interval of 3 day for Nativo use on dragon fruit farms, Maximum Residue Limit (MRL) of tebuconazole and trifloxystrobin were proposed at 1 mg/kg and 0.6 mg/kg, respectively and in term of dietary risk assessment, no chronic risk to the general population resulting from the proposed MRLs.

Keywords: residue field trial, Maximum Residue Limit (MRL), tebuconazole, trifloxystrobin, dragon fruit

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