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Spruce Tree Diseases - Symptoms & Control

Spruce Tree Diseases


Cytospora Canker

  • Symptoms

    • Sunken dead ares of bark and underlying wood form on the lower branches of the trees girdling small branches in 1 or 2 years and large branches after several years. Resin flows out of the cankers and may drip down on lower branches. Scattered lower branches die. Branch death progresses up the tree.
  • Management

    • Since the fungus readily infects wounded tissue but remains latent in the tree without causing symptoms until the tree is drought stressed, fungicide sprays cannot be effectively timed to prevent this disease. Select the planting site carefully, avoiding drought prone sites. Anticipate the future needs of the mature tree and consider whether the site has the potential to supply the water required of a specimen 50 - 60 feet tall. Prune infected branches. Blue, White, Red, Black, Englemann, and Norway Spruces are all susceptible to this disease.
Cytospora Canker on Blue Spruce
Cytospora Canker on Blue Spruce


Needle Rust

  • Symptoms

    • Year-old needles are cast after turning rust colored in the Spring. Blue Spruce is very susceptible, as are Black, Red, and White Spruces.
  • Management

    • ZeroTol Fungicide is a ready to use spray that provides immediate disease control for Rust on Pine Trees. It leaves no chemical residue behind, which makes it the natural choice for use around pets and children. BUY NOW!



Rhizosphaera Needlecast

  • Symptoms

    • Year-old needles turn lavender in color and have tiny, black fungal fruiting structures in rows on either side of the midvein on the underside of the needle. Large bare areas develop on the tree as needles fall.
  • Management

    • Apply Chlorothalonil when new shoots are 1 1/2 inches long and again 3 weeks later to protect young needles from infections that occur ion May through June.
Spruce Tree Rhizophaeria Needlecast
Rhizosphaeria Needlecast
Spruce Tree Rhizophaeria Needlecast
Rhizophaeria Needlecast

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