| HOST GENUS | PATHOGEN | ISOLATES |
| Corylus | Apple Mosaic Ilarvirus | 3+ |
| Corylus | Hazelnut Stunt ?Phytoplasma | 1 |
| Malus | Apple Blister Bark | 1 |
| Malus | Apple Chlorotic Leafspot Trichovirus | 2 |
| Malus | Apple Flat Limb | 1 |
| Malus | Apple Mosaic Ilarirus | 2 |
| Malus | Apple Rubbery Wood | 4 |
| Malus | Apple Stem Grooving Capillovirus | 4 |
| Malus | Apple Stem Pitting Virus | 8 |
| Malus | Apple Swollen Limb | 1 |
| Malus | Apple Swollen Stem (twisted twig) | 1 |
| Malus | Cherry Rasp Leaf Nepovirus (Flat Apple) | 1 |
| Malus | Genetic Variegation (non-chlorophyll mutant) | 1 |
| Mespilus | Apple Chlorotic Leafspot Trichovirus | 1 |
| Pyrus | Apple Stem Grooving Capillovirus | 3+ |
| Pyrus | Bark Disorders | 2 |
| Pyrus | Blister Canker | 3 |
| Pyrus | Concentric Fruit Ringpattern | 1 |
| Pyrus | Hardy Fruit Ring | 1 |
| Pyrus | Pear Blister Canker Viroid | 2 |
| Pyrus | Pear Decline Phytoplasma | 1 |
| Pyrus | Pear Ringpattern Mosaic Virus (ACLSV) | 4+ |
| Pyrus | Pear Vein Yellows Virus | 3+ |
| Pyrus | Rough Bark | 1 |
| Pyrus | Seedborne Vein Yellows | 3 |
| Pyrus | Stony Pit ?Virus | 8 |
| Sorbus | Chlorotic Leafspot ?Virus | 2 |
The presence and identities of some pathogens obtained from other research collections has not been confirmed.
Virus names have been made consistent with:
Plant Viruses Online - Descriptions and Lists from the VIDE Database
Version: 16th January 1997
Editors: Alan A. Brunt, Karen Crabtree, Michael J. Dallwitz, Adrian J. Gibbs, Leslie Watson and Eric J.Zurcher