The citrus systemic diseases, including Huanglongbing (caused by Candidatus Liberibacter asiaticus (CLas)), tristeza virus (CTV)), tatter leaf (CTLV)), and exocortis viroid (CEVd)), are threats to production in Taiwan. Reliable diagnostic methods important for the management of these diseases. In this study, we developed a multiplex reverse transcription–polymerase chain reaction (RT-PCR) assay...

plant samples were collected from yazd, isfahan, fars and tehran provinces and examined for their possible infection by hop stunt viroid (hsvd). the experimental host range of the viroid was determined by injection of infected sap into greenhouse grown seedlings and subsequent assay of inoculated plants by rt-pcr. fig, mulberry and citrus isolates of the viroid were compared with respect to hos...