Common Blue Spruce Tree Problems

Warmer weather means blooming spruce trees! As the buds begin to open and start developing new needles, it’s vital for you to watch out for these common pests and diseases that could pose a threat to your blue spruce tree.

Common Pests

Spider Mites

These tiny mites feed on young buds, causing the needles to brown and fall off the tree. Insecticides can help fend them off.


Blue spruce trees often fall victim to aphid attacks, especially if they are planted close to Douglas fir trees. Fend them off with carbaryl insecticide or horticultural oils.

Spruce Budworms

These moth larvae feed on new buds and frequent infestations can cause death to the tree. Insecticide can be used two to three weeks after bud break.


Blue Spruce Trees Infected by DiseaseRhizosphaera Needle Cast

Needle cast causes an excess number of needles to shed, ultimately damaging the plant. Chlorothalonil can kill the fungus.

Cytospora Canker

This is another fungus that causes lesions on the branches and trunk of a tree. Cut the infected tissue from the wound with a knife and rub the surface with ethyl alcohol. This is vital so that predators are not attracted to the open lesions.

Lirula Needle Blight

This fungus infection starts from the center of a branch and works its way out, causing browning and killing needles along the way. A fungicide like Chlorothalonil can help prevent lirula needle blight from harming your blue spruce tree further.

Spruce Point Tree Farm is a wholesale blue spruce tree farm in Colorado that has become a trusted source for hearty, beautiful, high-altitude Colorado blue spruce trees. Call us at 970-379-2241 for more information on our blue spruce trees!