A survey was carried out to validate the tissue-printing technique for detecting Peach latent mosaic (PLMVd) and Hop stunt (HSVd) viroids in stone fruit samples. The membranes were pressed in different countries and hybridised in a central laboratory. Clear-cut positive results were obtained in many samples for both viroids. The technique is fast, easy and reliable. These advantages made tissue-printing technique an appropriate method for a first screening to evaluate the sanitary status of stone fruit trees.