Problems Regarding the Detection of Graft Transmitted Pear Canker

Lemoine, J.

doi:10.17660/actahortic.1986.193.43

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Viroid Disease Caused By Pear Blister Canker Viroid (Pbcv1

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2018

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“…This viroid, with a genome of 315 nt, has been classified into the genus Apscaviroid (family Pospiviroidae ) [ 77 ]. Several bark disorders on certain pear cultivars had been described in Europe and USA, for which a common infectious agent was initially proposed [ 78 ]. However, with the identification of PBCVd associated with only one of these disorders [ 79 ], the situation appeared more complex, suggesting the likely involvement of different causal agents.…”

Section: Viroid Disease Caused By Pear Blister Canker Viroid (Pbcvmentioning

confidence: 99%

Viroid Diseases in Pome and Stone Fruit Trees and Koch’s Postulates: A Critical Assessment

Serio

Ambrós

Shimmen

et al. 2018

Viruses

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Composed of a naked circular non-protein-coding genomic RNA, counting only a few hundred nucleotides, viroids—the smallest infectious agents known so far—are able to replicate and move systemically in herbaceous and woody host plants, which concomitantly may develop specific diseases or remain symptomless. Several viroids have been reported to naturally infect pome and stone fruit trees, showing symptoms on leaves, fruits and/or bark. However, Koch’s postulates required for establishing on firm grounds the viroid etiology of these diseases, have not been met in all instances. Here, pome and stone fruit tree diseases, conclusively proven to be caused by viroids, are reviewed, and the need to pay closer attention to fulfilling Koch’s postulates is emphasized.

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Section: Viroid Disease Caused By Pear Blister Canker Viroid (Pbcvmentioning

confidence: 99%