Bud Blight Fungus

• The bud blight fungus grows on Colorado spruce trees and keeps the tree's buds from sprouting. Over time, the tree's branches will become deformed.
  
  

Bleeding Conifer Crust

• Bleeding conifer crust is a parasite that feeds on a spruce and causes a white rot to spread throughout the tree. The rot makes the tree susceptible to fungus infections.
  
  

Cytospora

• A Cytospora canker is the result of a fungus that begins at the base of a tree and works its way up, causing the leaves and branches to brown and eventually die.
  
  

Rhizosphaera

• Rhizosphaera needle cast is caused by a fungus and appears as patches of discolored bark on the tree. Often needles die off and leave the tree full of gaps.
  
  

Green Spruce Aphid

• Green spruce aphids are tiny insects that feed on the sap of the spruce tree. This causes the needles to wither and die.