What Causes Rhizosphaera Needle Cast?

What Causes Rhizosphaera Needle Cast? Rhizosphaera needle cast is caused by the fungus Rhizosphaera kalkhoffii. The fungus survives winter on living and recently killed needles. In spring through early autumn, spores spread to new needles within the tree or in neighboring trees via splashing water. How do you get rid of Rhizosphaera needle cast? Consider