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For rhizosphaera needle cast disease to … This year, cool spring temperatures and wet conditions favor development of needle cast diseases on spruce. Avoid planting spruce in heavy shade. The Blue Spruce is a coniferous tree in the pine family. Three primary diseases affect blue spruce and lead to dead or leafless branches: Cytospora canker: A fungal disease that affects older spruce trees, most commonly those more than 15 years old. However, spruce trees, like all plants, are also susceptible to attack by pathogens and arthropods, and they can suffer from environmental stress and other ‘non-contagious’ factors. What’s drawn particular notice this year is the demise of one of our favorite home-landscape conifers, the Colorado blue spruce. White pines have fewer disease problems than Austrian or Scots pines. Nymphs of the pineapple gall adelgid form galls at the base of twigs which resemble miniature pineapples and those of the Cooley's spruce gall adelgid cause cone-shaped galls at the tips of branches. Blue spruce trees are most commonly and most severely impacted. To properly care for your Blue Spruce, make efforts to prevent disease (or treat it before it can spread and cause more harm). Needlecast disease is taking a toll on Colorado blue spruces lately. Management • Management is not necessary on spruce with healthy crowns. However, as 2017 was a banner year for the fungus, I commonly saw it on white spruce and even on Norway spruce, which is supposedly resistant to the disease. Local blue spruce trees are falling prey to two fungal diseases as a result of rainy spring weather for the last two years. Cytospora canker, caused by the fungus Cytospora kunzei (also known as Valsa kunzei var. Find them at the tips of new growth. • Cooley spruce galls are mainly on Colorado blue spruce and white spruce. Wayne County Pennsylvania trees and shrubs spruce diseases spruce trees galls submitted over 3 years ago. Colorado Blue Spruces are very susceptible to Rhizosphaera needle cast, but other types of spruce are more resistant. Options include Norway spruce or Black Hills spruce. Symptoms include branches with brown needles that fall off or may stay on the branch as well as a white residue that looks like bird droppings. Diseases & Pests: Cytospora canker, needle cast, and rust diseases, mites, eastern Spruce gall adelgid, Cooley’s Spruce gall adelgid, bagworms, spruce budworm larvae, sawfly larvae, Reproductive System: Monoecious : Propagation: Through pollens : Wildlife Value: Cone scales are consumed by caterpillars, and barks are fed by moths : Cultivars: 1. This fungal disease causes premature death and casting of needles of conifers. Blue spruce seems to have the greatest damage, though the fungus infects other spruces as well. Spruce trees often thrive in North Dakota under the right conditions. It is also known as the “Colorado Spruce.” Unfortunately, this tree is susceptible to different diseases that affect the bark, needles, and surrounding trees. • Eastern spruce galls mainly affect Norway and white spruce. The blue spruce is attacked by two species of Adelges, an aphid-like insect that causes galls to form. piceae), is the most prevalent and destructive fungal disease of Norway and Colorado blue spruce.Occasionally, Cytospora canker is found on Douglas-fir, hemlock, and larch. CYTOSPORA CANKER. Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. Pests and diseases. The disease, referred to as Rhizosphaera needle cast, is the most common problem seen on blue spruce samples that are submitted to the Plant Disease Clinic. 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