Safe use of neonicotinoids in some vegetables in terms of residues
2016
Lazić, Sanja | Šunjka, Dragana | Vuković, Slavica
Despite their high efficacy and increasing use in crop protection, data on the residual status and dissipation of the neonicotinoids in vegetables are limited. Therefore, the principal objective of this study was to generate data regarding the persistence and residue levels of neonicotinoid insecticides in selected vegetables. To investigate the dissipation of acetamiprid and thiacloprid in pepper and tomato fruits, field studies were done under controlled greenhouse conditions. Insecticides were applied in accordance with manufacturer’s recommendations for Aphids control. Samples were randomly collected immediately after the application and every second day during the pre-harvest interval (PHI). For sample pre-treatment QuEChERS procedure was used, followed by HPLC-DAD analysis. In this study, MRLs of acetamiprid in pepper and tomato fruits achieved the second and sixth day after the insecticide application, respectively, while thiacloprid residue in pepper fruits were under MRL two days after the application. The half-life (DT50) of insecticides fitted to a first order kinetic equation. DT50 of acetamiprid in pepper (3.9 days) and in tomato samples (4.3 days), as well DT50 of thiacloprid in pepper fruits (4.9 days), obtained in this study were similar. Finally, PHI for acetamiprid in pepper and tomato (14 days) and thiacloprid in pepper fruits (7 days), which has been established by Serbian authorities, are proved to be safe enough for application of these insecticides in greenhouse production of pepper and tomato.
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