Cytospora Canker of Spruce
Cytospora spp., Sphaeropsi sapineas, Siroccus conigenus are the only cankers found on spruce at this time. Of the three, Cytospora spp. is the one that does the vast majority of the killing It is the number one killer of the Colorado blue spruces and only occurs on spruces when the trees are not grown in their native range.
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