The invention relates to a method for the analysis of pesticide residues in plants. The inventive method uses the interface device for the direct coupling of liquid chromatography and gas chromatography, known in scientific literature as TOTAD interface (Through Oven Transfer Adsorption Desorption). The method simply requires an extraction step prior to the chromatographic analysis. The pesticides are extracted from the sample with an organic solvent. Volumes of extract, which are much greater than those normally used, are injected directly into the gas chromatography, without requiring any prior extract concentration or cleaning step. The TOTAD interface enables the injection of volumes of extract that are much greater than those normally injected into the gas chromatography.