When we see diseases in blue spruce, which is not often, it usually is one of two different types--Cytospora Canker and Rhizospharea Needle Cast. The most common canker disease observed in the Iowa ...

Stigmina is the fungus most commonly encountered in association with diseased spruce samples ... Stigmina and Rhizosphaera are primarily seen as a disease of blue spruce (Picea pungens), but white ...

Lab analysis is necessary to distinguish Rhizosphaera needle cast from other diseases of spruce trees. Submit a sample to the UMN Plant Disease Clinic for testing. Colorado blue spruce (Picea pungens) ...

These spores can only infect the alternate host plant and do not reinfect the spruce. At the end of the growing season, infected spruce needles often turn yellow and in most cases fall off. During ...

much of the damage we see on blue spruce in Ohio is due to a fungal pathogen called rhizosphaera. This fungal disease typically attacks the lower branches of the tree first and eventually spreads ...

Many spruce stands on the islands and headlands of coastal Maine are overmature and growing on poor sites. Most stands have not been managed to promote more vigorous tree growth. These factors ...

Our native eastern larch is also susceptible, although the disease is not perpetuated on larch in the absence of spruce. Occasional, rare hosts include blue spruce, Norway spruce, jack pine, red pine, ...