Abstract
A total of 109 samples of potato seed tubers imported to Jordan from France, Netherlands and Denmark during the 2007/2008 growing seasons were surveyed for 10 different diseases caused by fungi and fungus‐like organisms to determine the prevalence of different tuberborne diseases and to evaluate the efficacy of the current visual examination procedures in detecting different potato diseases. The results demonstrated that most potato seed tuber lots imported to Jordan were infected with one or more of the following potato pests: Colletotrichum coccodes (black dot) (66.0%), Rhizoctonia solani (black scurf) (42.4%), Helminthosporium solani (silver scurf) (92.6%), and Spongospora subterranea (powdery scab) (13.8%). Just over a quarter (25.7%) of all lots examined in this study were found to exceed the acceptance limits for one or more potato diseases according to the Jordanian standards. This study suggests that the current visual examination procedure is not adequate to detect all tuberborne diseases of potato and to estimate their incidence and severity precisely.
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