Gymnosporangium clavipes (quince rust)
Identity
- Preferred Scientific Name
- Gymnosporangium clavipes (Cooke & Peck) Cooke & Peck
- Preferred Common Name
- quince rust
- Other Scientific Names
- Caeoma germinale Schwein.
- Gymnosporangium germinale F. Kern
- Podisoma gymnosporangium var. clavipes Cooke & Peck
- Roestelia aurantiaca Peck
- International Common Names
- Englishrust: applerust: Juniperus spp.rust: quince
- Spanishroya del membrillo sobre manzanoroya del membrillo sobre peral
- Frenchrouille du cognassierrouille du cognassier sur poirierrouille du cognassier sur pommier
- Local Common Names
- GermanyRostRost: ApfelRost: Quitte
- EPPO code
- GYMNCL (Gymnosporangium clavipes)
Pictures
Quince rust on cedar
Quince rust canker on cedar with gelatinous spore horns fully extended.
T.B. Sutton
Symptoms on apple
Distortion of calyx end and red discoloration of Delicious apple caused by quince rust.
T.B. Sutton
Distribution
Host Plants and Other Plants Affected
| Host | Host status | References |
|---|---|---|
| Amelanchier (serviceberries) | Other | |
| Aronia (chockeberry) | Other | |
| Chaenomeles (flowering quinces) | Other | |
| Crataegus (hawthorns) | Other | |
| Cydonia oblonga (quince) | Main | |
| Juniperus communis (common juniper) | Other | |
| Juniperus virginiana (eastern redcedar) | Other | |
| Malus domestica (apple) | Other | |
| Mespilus (medlar) | Other | |
| Pyrus calleryana (bradford pear) | Unknown | Creswell et al. (2016) |
| Pyrus communis (European pear) | Other |
Symptoms
On Juniperus, G. clavipes causes slight fusiform swellings on twigs and larger branches (see Morphology). The fungus causes severe symptoms on fruits of its aecial hosts apple and quince. Dark-green lesions appear at the calyx end, extending to the core, and causing distortion of the fruit, without necessarily any obvious sign of rust. The fact that the lesions extend to the core distinguishes this species from G. juniperi-virginianae (EPPO/CABI, 1996), whose fruit lesions are only superficial (Aldwinckle, 1990).
List of Symptoms/Signs
| Symptom or sign | Life stages | Sign or diagnosis |
|---|---|---|
| Plants/Fruit/abnormal shape | ||
| Plants/Stems/galls |
Prevention and Control
G. clavipes can be adequately controlled on apples by routine fungicide applications (for example, sterol-inhibiting fungicides). Varietal differences in susceptibility of apple are known for G. clavipes (Warner, 1990). Suppression of the alternate hosts (Juniperus communis and J. virginiana) within a certain radius of orchards is recommended, but may be difficult as they are often present in private gardens.
Impact
The rust can be severe on apple fruits in eastern North America, but is a less important pest than G. juniperi-virginianae (EPPO/CABI, 1996). Ziller (1974) knew of no reports of serious damage in western Canada.
Information & Authors
Information
Published In
Copyright
Copyright © CABI. CABI is a registered EU trademark. This article is published under a Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
History
Published online: 16 November 2021
Language
English
Authors
Metrics & Citations
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