ICTVdB - Description of Viroids. RNA species, Abbr. Scientist Studies Use of Viroids to Produce Dwarf Citrus Trees. Dr. Joseph Semancik. Scientist Studies Use of Viroids to Produce Dwarf Citrus Trees.
Viruses are pathogens with an extremely narrow host range.
PLSC 303 - Viruses and Viroids PLSC 303. Specific Diseases Caused by Viruses and Viroids. Infects tobacco, tomatoes, beets, peppers, etc. Viroids Viro des. Villalobos occurrence citrus viroids Costa Rica Occurrence of citrus viroids in Costa Rica.