02458naa a2200277 a 450000100080000000500110000800800410001902200140006002400390007410000140011324501470012726000090027450003920028352012610067565000110193665300180194765300130196565300230197865300280200170000220202970000160205170000160206770000140208370000160209777300670211310599402019-01-25       2019    bl uuuu     u00u1 u    #d  a0304-42387 a10.1016/j.scienta.2018.12.0532DOI1 aBESIL, N.  aDissipation of selected insecticides and fungicides applied during pre-harvest on mandarin and orange trees in Uruguay.h[electronic resource]  c2019  aArticle history: Received 4 October 2018 / Revised 28 December 2018 / Accepted 29 December 2018 / Available online 9 January 2019. Funding sources: Financial support from Instituto Nacional de Investigación Agropecuaria Uruguay, (L2_12_1_VI_CT_GT4_7639 project). N. Besil is grateful to Agencia Nacional de Investigación e Innovación, Uruguay, for her scholarship POS_NAC_2012_1_9348.  aABSTRACT. The dissipation of 4 commercial pre-harvest pesticides used in two Citrus species under field conditions is presented. The influence of agroecological region, the Citrus species and weather conditions on abamectin, spinosad, imidacloprid and difenoconazole dissipation rate on fruits were evaluated. A validated ethyl acetate method coupled to liquid chromatography-tandem mass spectrometry allowed the determination of pesticide residues having recoveries of 72?115%, relative standard deviations ≤16% and quantification limits below the international Maximum Residue Levels (MRLs). After 35?40 days from pesticides spraying, all residues were below the international required MRL. For each citrus species, the influence of the agroecological region on the pesticide dissipation was assessed. Film-protected fruits against direct radiation and rain showed higher residue levels of imidacloprid and spinosad than the non-protected ones. Either for orange or mandarin, abamectin residues were detectable only at the first day after application. These findings provide useful information to state safer pre harvest intervals and to ensure food safety and compliance with good agricultural practices. © 2019 Elsevier B.V. All rights reserved.  aCITRUS  aCITRUS FRUITS  aLC-MS/MS  aPESTICIDE RESIDUES  aPRE-HARVEST DISSIPATION1 aPÉREZ-PARADA, A.1 aBOLOGNA, F.1 aCESIO, M.V.1 aRIVAS, F.1 aHEINZEN, H.  tScientia Horticulturae, 5 April 2019, Volume 248, Pages 34-40.