Cultivated Azalea Nude Basidy
| Cultivated Azalea Nude Basidy | ||||||||||||
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Cultivated Azalea Naked Basidia ( Exobasidium japonicum ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Exobasidium japonicum | ||||||||||||
| Shirai |
The culture Azalea Nacktbasidie ( Exobasidium japonicum ) is a smut fungus art from the family of Nacktbasidienverwandten (Exobasidiaceae). It lives as an endoparasite on azaleas ( Rhododendron spp.) And infects their leaves. Symptoms of infestation by the cultivated azalea naked basid are red, severely swollen leaf galls that are eventually overgrown by mycelium . The disease that is triggered is also called earlobe disease . The species comes from Japan, but has also been introduced to other parts of the world.
features
Macroscopic features
The culture azalea naked basidia is initially invisible to the naked eye. The initial symptoms of the infestation can be seen on the leaves: The leaves of infected azaleas form red spots, then galls up to 3 cm in size on the underside of the leaves. Later, the chalk-white mycelium of the fungus breaks through and overgrows the bile.
Microscopic features
The mycelium of the cultivated azalea naked basid grows intercellularly and forms suction threads that grow into the storage tissue of the host. The four- to five-pore basidia are long, unseptate and narrow-lobed, the banana-shaped spores are hyaline , 12–20 × 3–4.5 µm in size and have thin walls.
distribution
The cultivated azalea nude basid was originally described from Japan, but the species was introduced to other parts of the world, including Europe and North America, through the introduction of cultivated azaleas.
ecology
The cultivated azalea nude basid attacks Rhododendron indicum and closely related species. The fungus feeds on the nutrients present in the storage tissue of the plants, its basidia later break through the stomata on the underside of the leaf and release spores, which are then spread by the wind. However, the infection can also occur through physical contact with leaves.
swell
- C. Booth: Exobasidium japonicum. In: CMI Descriptions of Pathogenic Fungi and Bacteria 780, 1983.
- German Josef Krieglsteiner (Ed.): The large mushrooms of Baden-Württemberg . Volume 1: General Part. Stand mushrooms: jelly, bark, prick and pore mushrooms. Ulmer, Stuttgart 2000, ISBN 3-8001-3528-0 .