Persistance and dissipation dynamic of cyantraniliprole in tomato

Tomato growing in the field, and especially in indoor conditions requires regular chemical protection. Тhis vegetable belongs to the row of cultivated plants that are highly susceptible to great number of diseases and pests. From the aspect of safety use of pesticides, and production of high quality and safety food, monitoring of pesticide residues in agriculture products is necessary, and especially in those that are in consumption the most frequently use fresh, such as tomatoes. In this paper the study was carried out with the aim of obtaining an insight into stability of cyantraniliprole insecticide in fruits of tomato grown in greenhouse production, after its use for control of greenhouse whitefly Trialeurodes vaporariorum. The trial was set according to the standard OEPP method, in tomato variety Faidra F1 (Hazera Genetics). The Plant protection product Exirel (100 g/l cyantraniliprole) was applied according to the recomended quantity of 0.75 l/ha, in the fruiting phase. Tomato plants were sampled immediately after drying of the deposit, and after that daily, during the seven days period. Determination of cyantraniliprole residues in tomato fruits using modified QuEChERS method was followed by analysis with HPLC-DAD. The highest residue level was in samples taken 1 h after pesticide application (0.195 mg/kg). After the first day, the average value of cyantraniliprole residues was 0.090 mg/kg. Cyantraniliprole residue levels kept decreasing in the following period, finally reaching the level of 0.027 mg/kg with dissipation of 86% seven days after application. The achieved results showed gradual and continuous lowering of cyantraniliprole level, with the degradation coefficient of 0.861. The half-life (DT50) of cyantraniliprole in tomato fruits obtained in this study was 2.4 days. Finally, at the end of pre-harvest interval (PHI), cyantraniliprole residues in tomato fruits were below the MRLs of 1 mg/kg and PHI prescribed by Serbian authorities was proved to be safe enough in greenhouse production of tomato.