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| Analysis - view details of type of pest/disease/disorder | |
| Symptoms | In early summer 1 – several yellow cross-bands on the needles; from August on spore cushions in the bands (aecidia), which later on release high numbers of orange-yellow (aecidio-)spores. The cushions are surrounded by whitish sheets. Needles drop. | |
| Impact | Periodically common at the upper tree line, more rarely in lowlands, only, where spruces and Rhododendron species are growing in close vicinity, since the spread of the fungus requires both hosts. The number of spores developing in Rhododendron-leaves in spring is probably the triggering factor for outbreaks on spruce, since these spores infect new needles following especially mild winters. Up to now even repeated intense attacks didn't cause loss of spruces, with the exception of very young plants. Further information (in German) see Gehölzkrankheiten in Wort und Bild (TUM Weihenstephan) | |
| Control | Measures are not known, any eradication of the main host (Rhododendron) is impossible due to nature protection laws in the alpine areas. | |
| Hosts | Spruce; | |
| Affected plant parts | Needle; |
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| Symptoms on Picea abies, intense infestation |
Needle of Picea abies with aecidia |
Symptoms on Picea abies, moderate infestation |
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| Spruce needle rust: uredo-form on leaves and shoots of Rhododendron |
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