Potato spindle tuber (PSTVd) (Pospiviroid Potato Spindle Tuber Viroid) is a viral pathogen.
Affected Potato tubers of some varieties are small, narrow and spindle-like. In other varieties tubers develop knobs and swellings. In some varieties eyes are numerous, shallow and more prominent, and tubers are often cracked.
For more information about this plant pest, see the CAPS data sheet and the CABI data sheet.