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Dissipation Behavior of Thiophanate-Methyl in Apple and Strawberry Fruits under Open Field Conditions

Dalia, E. El-Hefny; Rania, M. Abdel-Hamid, and Maher S.Salma

Thiophanate-methyl is an effective fungicide on several food crops. In the present study, dissipation of
residue levels of thiophanate-methyl in apple and strawberry fruits under open field conditions were studied
using high performance liquid chromatography with diode array detection (HPLC-DAD).The extraction
and clean-up were conducted by QuEChERS method. The limit of quantitation and detection were 0.01 and
0.003 mg/kg, respectively. The results suggest that the thiophanate-methyl dissipation curves followed the
first order kinetics and its half-life values were (1.01) and (1.26) days for apple and strawberry, respectively.
The residues in apple and strawberry were below the codex maximum residue limit (MRL) (0.5 and 0.1
mg/kg) after 8 and 4 days of the application, respectively.
Key words: Residues, Thiophanate-methyl, apple, strawberry.