Dissipation behavior and residual levels of three pesticides (captan, spirodiclofen, and
thiophanate methyl) applied to apple trees were studied using QuEChERS extraction method under
climatic conditions in Egypt. The residues of tested pesticides were determined after one hour, 1, 3, 7,
10 and 15 days. The apple samples of captan, spirodiclofen, and thiophanate methyl contained residues
lower than the maximum residue limits (MRL) (3, 0.8 and 0.5 mg/kg) so that the apples fruits could be
used safely at any time after 3 days of application. The half-life values (t 1/2) were 2.47, 0.91 and 1.09
days for captan, spirodiclofen and thiophanate methyl, respectively.