Common pine tree diseases include Rhizosphaera needle cast and Cytospora canker fungus. Symptoms of both needle cast diseases look similar to each other. The recent pattern of milder than usual winters and cool spring temperatures combined with wet conditions in the northeast have favored development of a fungal disease known as "needle cast". To properly care for your Blue Spruce, make efforts to prevent disease (or treat it before it can spread and cause more harm). At planting time, landowners should consider trees other than blue spruce… Norway spruce (P. abies) is highly resistant to this disease. Trees that are 15 years old or older and are at least 20 feet high most typically show symptoms of this disease. Symptoms may first appear in mid- to late-summer as … Management & Treatment … Always disinfect the equipment when done pruning. It starts on the inner and lower growth … The classic symptoms of needle cast include brownish purple discoloration and eventual death of older needles, while current-year needles show no symptoms (Figure 1). Other hosts include: deodar cedar, Douglas fir, true firs, hemlocks, pines and coast redwood. Symptoms. Fungi from several species of the genus Chrysomyxa create needle rust, affecting both cones and needles. Cytospora canker ra… It is most common in trees growing outside of their native range. It is also known as the “Colorado Spruce.” Unfortunately, this tree is susceptible to different diseases that affect the bark, needles, and surrounding trees. But, some blue spruce will be much more susceptible to this needle disease throughout their lives, regardless of the weather, and may need continued treatment to maintain a full complement of foliage. The... Tree Fungal Infections: How to Manage. These diseases primarily affect blue spruce. Examining the tree is the first step in addressing disease. The Blue Spruce is a coniferous tree in the pine family. Another fungal disease affecting spruces is Rhizosphaera needlecast. Place all the branches, needles, and other material in trash bags and properly dispose of it. The Blue Spruce is drought tolerant, meaning it can survive in prolonged dry periods. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. You may notice orange spores or projections on the tree, which affect seed viability. Some spruce trees, such as Colorado Blue Spruce may be susceptible to environmental stress. Early detection and proper diagnosis is important in the treatment … Susceptibility varies widely among species, but generally trees under stress or growing outside their natural range are more prone to the disease. These are signs the tree may defoliate. This disease can also affect Norway spruce (and less frequently other spruces) as well as Douglas-fir and balsam fir. These are signs the tree may defoliate. Examining the tree is the first step in addressing disease. This needs to be done during the dry weather to further keep the disease from spreading. While fungicide sprays cannot be timed to effectively control the disease, dead branches should be removed in late winter or during dry weather. If you have seen trees affected by needle cast disease in the area, avoid planting this highly susceptible tree. If a tree has this problem, cut off branches. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. Cytospora Canker of Spruce particularly attacks blue spruce, in addition to Norway spruce, hemlock, red cedar, fir and white pine trees. Check if the tree has yellow or red colour or is covered with black spots. Another key characteristic of needl… In time, trees will become unsightly and should be removed. Spectro-90, or … White spruce … Instead, consider planting Norway spruce, which is resistant. Check if the tree has yellow or red colour or is covered with black spots. If affected trees cannot be treated, the tree must be removed to prevent the disease from spreading to other trees. If you notice these signs, prune all the affected areas. Many spruce species, such as Colorado blue and Engelmann spruce are highly susceptible; white spruce is intermediate in susceptibility. The Cytospora canker, a stem disease, affects branches and trunks of trees. The Blue Spruce is a beautiful addition to any property, but obviously needs some special care. piceae), is the most prevalent and destructive fungal disease of Norway and Colorado blue spruce. Similarities and differences between the two diseases exist. When you first plant trees, water them every week during the first year until the ground freezes. Some Colorado blue spruce cultivars, like ‘Hoopsii,’ and ‘Fat Albert’ are reportedly more resistant to the disease.
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