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Spruce needle rust – Chrysomyxa abietis | deutsch

Symptoms    Youngest needles in summer with one to several yellow cross bands; in these bands dark orange-red cushions or longitudinal stripes (spore bearing structures), which – by contrast to the alpine spruce needle rust (Chrysomyxa rhododendri) never produce spore dust; loss of needles.
Impact    In early summer commonly following extensive rainfall or on sites with high humidity. Especially in Christmas tree plantations this rust may cause heavy losses of needles lowering the value of the trees; however, the disease is never endangering the life of a tree. Further information (in German): Gehölzkrankheiten in Wort und Bild (TUM Weihenstephan).
Control    Fungicides controlling rusts only in commercial plant production (see official register of Plant Protection) and only in heavily infested stands.
Hosts   Spruce;
Affected plant parts    Needle;


Chrysomyxa abietis: heavily infested needles of Picea pungens with orange red spore cushions (Teleuto-form)
Chrysomyxa abietis: heavily infested needles of Picea pungens with orange red spore cushions (Teleuto-form)
Chrysomyxa abietis: unripe spore cushions (Teleuto-form) in light yellow cross bands (Picea pungens)

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