In order to improve the quality of stone fruit propagation material, the San Pedro Experiment Station began a program of diagnosis and monitoring of its collections, in order to know its status regarding  three Ilarvirus and one Potyvirus, and to identify healthy varieties. The diagnosis was made using the DAS-ELISA technique, with the recommended protocol for the corresponding kits. Samples were analyzed in duplicate and the results were read on a Multiskan MS Labysistem reader. Absorbance readings (A 405) greater than three times the mean of the healthy controls were considered positive. Consistent composite samples of 8 leaves / 2 plants / variety selected from the four main branches were analyzed. PNRSV had an approximate average incidence of 30%, in the different collections monitored. PDV and ApCLSV were detected in less than 5%. No varieties or hybrids were affected by PPV or ApMV. 38 varieties of peach, 25 of nectarine and 37 of plum were negative to the analyzed viruses.