The Uruguayan Citrus plantations develop in south and north regions. The southern region is windiest with lower temperatures, suggesting the hypothesis that weather variations could cause different pesticide decay behavior in the field. To prove it, nontraditional pesticides were applied to cvs. Nova (mandarine) and Navelina (orange) trees. Fruiting trees were individually treated with Abamectin, Spinosad, Difenoconzole and Pyraclostrobin. Sunlight and rain wash up influence were also tested, protecting half of the fruits. Samples were taken for 35 days after application, AcOEt extracted and quantified by LC-MS/MS. All the pesticides residues were below the MRLs at the end of the trial and the differences in residue levels between both regions were not significant, varying with the type of fruit tested. As a rule, insecticides dissipated faster than fungicides. The protected fruits showed higher residue levels of insecticides than non protected ones but the differences between fungicides were not significant.

Evaluation of dissipation times of fungicides and insecticides applied on citrus orchards in Uruguay

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.