Grapevine viroid
Encyclopedia
The grapevine viroid is a viroid
Viroid
Viroids are plant pathogens that consist of a short stretch of highly complementary, circular, single-stranded RNA without the protein coat that is typical for viruses. The smallest discovered is a 220 nucleobase scRNA associated with the rice yellow mottle sobemovirus...

 that is a type of hop stunt viroid
Hop stunt viroid
The hop stunt viroid is a viroid species that infects the common hop plant, citrus plants and grapevines, among others. It is a member of the Pospiviroidae family and the Hostuviroid genus....

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Types of grapevine viroids:

Australian grapevine viroid

Grapevine yellow speckle viroid
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