In order to elucidate residual characteristics of Thiametoxam and its metabolite Clothianidin by application to strawberry and tomato, and to generate the data for the maximum residue limit (MRL) establishment in an importing country for Thiametoxam. Thiametoxam WG (10% a.i) was applied onto tomato and strawberry according to its safe use guideline. Strawberry was drenched 2 times at a 10 day intervals, and tomato was foliar sprayed 3 times at a 7 day intervals. Strawberries and tomatoes were harvested after final application from pesticide-applied plots, respectively. The residue of Thiametoxam and its metabolite Clothianidin were analyzed using HPLC-UVD. The average recoveries of Thiametoxam and its metabolite Clothianidin at three different fortification levels were ranged from 82.1 to 98.1% and the coefficient of variations (CV) was less than 10%. The residue range of Thiametoxam in strawberry was 0.04 ～ 0.16 mg/kg and the residue was decreased to below MRL (1.0 mg/kg, KFDA) in 0 day harvest samples after final application. The residue range of Thiametoxam in tomato was 0.04 ～ 0.13 mg/kg and the residue was decreased to below MRL (0.2 mg/kg, KFDA) in 3 day harvest samples after final application. The biological half-life of Thiametoxam was 24 days.

Residue analysis of thiametoxam and its metabolite clothianidin during cultivation of strawberry and tomato

256th National Meeting (2018)

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