The significance of vegetative propagation as a source of primary inoculum in spread of black rot (or streak disease), caused by Phoma wasabiae, was investigated in this study.

• 摘要本研究主在探讨山葵黑心病菌可能危害山葵之主要感染源，以明瞭山葵黑心病菌在田间发生扩展之情形；