Until now, no insect vector for these viruses has been found. Theuse of healthy propagation materials and plants is a very effectiveway for preventing the transmission of these viruses and control-ling the viral diseases. Therefore, the establishment of sensitive,reliable, fast and inexpensive detection methods for these virusesis of critical importance for the certification and quarantine pro-grams of pear plants and germplasm. Previously, these viruseswere mostly based on biological indexing with woody indicators(Fridlund, 1989) and serological assays (Clark and Adams, 1977;Gugerli and Ramel, 2004). Currently, RT-PCR assays have beendeveloped and widely used for the detection and identification