Cronartium ribicola

Äcidiosporenlager to Strobenstamm

The Weymouthkiefern - blister rust, strobing - blister rust or Strobenrost ( Cronartium ribicola ) is a pathogen of the family of Cronartiaceae, the swellings, resin flow and orange-yellow Aecien five noble pines as Weymouth pine and stone pine pine causes and as Dikaryont currants (Ribes spp attacks. ).

Ecology

The Strobenblasenrost occurs only at five noble pines as Haplontenwirt. On the Haplontenwirt is the formation of bubble- shaped Aecien, infect their spores in the dikaryotic phase, the leaves of currants (Ribes spp.). Here is an infestation of leaf upper side by brownish Uredolager and in the Fall by säulchenförmige, yellow-brown Telien leaf undersides. The cycle is completed by the formation of basidiospores, so yet again to infect the jaw in the fall. The fungus migrates symptoms on the needles into the cortex, where it comes back later in the formation of spermogonia Aecien and in the following year or several years. In addition to the strobe almost all North American five noble pines ( Western White Pine, Flexible pine and sugar pine) are heavily infested. Less susceptible species such as the Eurasian pineal and Macedonia pine are (Pinus peuce ). The tears pine is the Weymouth pine forest structurally almost equivalent but less prone to rust. Of the Dikaryontenwirten the cultural forms of currant and gooseberry are particularly vulnerable rust.

Dissemination

Originally Strobenrost was native only in the field of pineal pine in the Alps and in Siberia, where the species was only slightly damaged. When people began to cultivate the highly susceptible Weymouth pine in Europe, the fungus spread across Europe and reached by diseased plants imported to North America. Here were next to the Weymouth pine, the Western White pine affected, especially since many fragile Ribes species were available. Today, the Strobenrost one of the major diseases fünfnadeliger pines.

Measures

With the obligatory change of host, the disease is greatly reduced by spatial separation of at least 500 m of the two hosts. Besides helping an early removal of the lower branches up to 1-2 m in height with later pruning to 3-4 m, using relatively resistant plants. In addition, the Strobenanbau should not take place under cool, damp conditions and not in loose wind-exposed stocks.