Infection rate of Chrysanthemum stunt viroid (CSVd) in 64 commercial chrysanthemum cultivars cultivated in Korea ranged from 9.7 to 66.8%. Symptoms on leaves of CSVd-infected chrysanthemum included yellow spots,chlorosis, vein clearing, vein bending and crumpling. CSVd induced flower malformation in ``Scot``, color change in ``Sharotte``, and color breaking in ``Sharon``. CSVd caused reduction of plant height, leaf size, flower size and the flowers number by 32-50%, 26-35%, 14- 36% and 14-75%, respectively. In conclusion, CSVd affected plant height, leaf size and flower quality in chrysanthemum plants.