Introduction
Pesticides are powerful chemicals widely used in current agricultural practices around the world, and it is common that pesticides occur in food products. Nevertheless, pesticides continue to be used because they contribute significantly to the control and elimination of various types of pests and thereby improve food production throughout the world. Organic farming (OF) and integrated pest management (IPM) are ecological approaches to agricultural pest control (1). The use of pesticides is prohibited in OF and strictly limited in IPM. IPM is an approach that relies on current, comprehensive information on the life cycles of pests and their interaction with the environment. OF systems rely on prevention rather than cure. However, the frequency of food pesticide contamination is greater than expected, and pesticide control is required. Increasing public concern about health risks from pesticide residues in the diet has led to strict regulation of maximum residue levels (MRLs) in food (2, 3). There is growing interest in developing simple and reliable methods for the analysis of trace contaminants in fruits and vegetables. Routine and comprehensive testing of multiresidue pesticides is a challenging task because of the presence of large amounts

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