DISSIPATION RATE AND RESIDUES OF ACETAMIPRID AND IPRODIONE IN SWEET CHERRY FRUITS

Abstract

A neonicotinoid insecticide acetamiprid and dicarboximide fungicide iprodione,are used in sweet cherry for control of the major pest (Rhagoletis cerasi L.) andpathogen (Monilia laxa). For the purpose of the safe consumption of agriculturalproducts after pesticide application, studies on their dissipation kinetics areessential to work out their half-lives (DT50) and pre-harvest intervals (PHI).However, there is a lack of information on the persistence of acetamiprid andiprodione in sweet cherry fruits in different climatic conditions of production.Therefore, the objectives of this study were to investigate the dissipation andresidues of acetamiprid and iprodione in sweet cherry fruits, as well as to evaluatethe validity of prescribed PHI for these pesticides. Field experiments wereconducted in a sweet cherry orchard, near Novi Sad, where acetamiprid andiprodione were applied at a recommended concentration. At various time intervals,from treatment to harvest, having in mind PHI (14 days for acetamiprid and 7 daysfor iprodione) representative samples of sweet cherry fruits were collected.Extraction of pesticides was carried out by QuEChERS method, followed byHPLC-DAD analysis. The method was validated in accordance with theSANCO/12571/2013 document and was used the determination of pesticides inreal sweet cherry samples. During the study period, the concentration ofacetamiprid and iprodione decreased from 0.52 mg/kg to 0.11 mg/kg and from 0.29mg/kg to 0.07 mg/kg, respectively. The dissipation of acetamiprid and iprodioneresidues over the time fitted to the equation Ct=0.52-0.22t and Ct=0.29-0.20t, with DT50of 3.15 and 3.47 days, respectively. Finally, the content of acetamiprid andiprodione in sweet cherry samples, at the end of PHI, were below the maximumallowed level specified by the Serbian (1.5 mg/kg and 3 mg/kg) and EU MRLs (1.5mg/kg and 10 mg/kg).