If dry conditions occur, water deeply if feasible. Well-timed sprays in the spring will normally suppress Rhizosphaera to non-detectable levels in the population of trees. Fungicide sprays are generally not effective at controlling canker diseases. Pruning the lower branches off will allow better air flow under the tree and dry off the needles more quickly after rain or dew events. Control - If symptoms appear, diseased trees should be sprayed with a fungicide in the last 2 weeks of May and again 4 to 6 weeks later. var addy329dab251343736a54bc869a40f25fa4 = 'kretz' + '@'; Rhizosphaera needle cast is a fungal disease, caused by Rhizosphaera kalkhoffii that attacks the needles of Colorado blue spruce in the spring, as new needles emerge. Sign up for our newsletter to receive event notifications as well as articles on forestry and land management. 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. Some branches may need to be pruned back to the trunk. Hi Franklin County, it sounds like your blue spruce had the Rhizosphaera Needlecast fungus in the needles and then throughout the tree. This is what she shared: Al: How can landowners identify Rhizosphaera needle cast? Cytospora canker is observed most often on older trees, especially those that are planted in poor sites. Policies | Common Blue Spruce Diseases Common pine tree diseases include Rhizosphaera needle cast and Cytospora canker fungus. Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. You need JavaScript enabled to view it. For Staff | State & National Extension Partners | This disease causes needles on Colorado Blue Spruce to turn a purplish brown color before dropping from the branches prematurely. Linda: Rhizosphaera needlecast does very well during wet years. You can also get this publication at the extension office in Logan. Rhizosphaera needle cast (caused by the fungus Rhizosphaera kalkhoffii) primarily infects Colorado blue spruce, while Stigmina needle cast (caused by the fungus Stigmina lautii) affects both blue spruce and Black Hills spruce. Inconspicuous cankers develop on lower branches—the cankers girdle the branches causing resin to flow out of the cankers and drip down the trunk of the tree. Another needle disease with similar symptoms that we’re seeing quite a bit of this year is Stigmina needle cast. « Kretz Lumber Company Spring 2018 Photo Contest, How can a land management plan benefit your woodlot? Al: What does this disease do to the tree? The spores spread by means of rain drops, animals and pruning tools. addy329dab251343736a54bc869a40f25fa4 = addy329dab251343736a54bc869a40f25fa4 + 'kretzlumber' + '.' + 'com'; Infected trees produce this resinous sap in response to the infection by the canker fungus. Cytospora canker fungus infects blue spruce trees through wounds in the branches. The fungal spores of Cytospora can be easily spread when conditions are wet. From what I have read on the subject, all the blue spruce and white spruce trees are susceptible. White spruce are classified as intermediate in susceptibility to the disease and Norway spruce are relatively resistant. var addy_text329dab251343736a54bc869a40f25fa4 = 'email';document.getElementById('cloak329dab251343736a54bc869a40f25fa4').innerHTML += ''+addy_text329dab251343736a54bc869a40f25fa4+'<\/a>'; Pruning out diseased branches is the primary means of treating trees showing symptoms of Cytospora canker. Scout declining trees closely for cankers. However, in some plantations needle casting symptoms still occur after sprays (Photos 1 and 2). This email address is being protected from spambots. Colorado blue spruce are not native to Michigan and so suffer from a large variety of diseases, pests, and climatic challenges. As with many diseases, the best control for Cytospora canker is prevention. Second-year needles turn a purple or brown color and eventually fall from the tree. Norway spruce is more resistant but we’re even seeing some of those trees being … Linda: Rhizosphaera needle cast is a fungal needle disease that causes needles to die and drop off the tree prematurely. The most common canker disease observed in the Iowa State University Plant Disease Clinic is Cytospora canker on blue spruce. This spring and summer, we have found that spruce trees, which include blue, white and Norway species, are under attack. The extended wet weather of 1993, for instance, has been responsible for needle browning and even tree death in some cases. This greatly reduces … Infected branches display cankers that are covered with white-blue colored sap. The fight against rhizosphaera needle cast. The Cytospora canker fungus may attack many different species of hardwood trees, conifers, and shrubs. I am including a list of these issues assembled by a colleague of mine, Barb Houchins. At planting time, landowners should consider trees other than blue spruce, since it is prone to infection by Rhizosphaera. They are being impacted by a fungal disease which goes by the name of Rhizosphaera needle cast. Spruce trees infected with the Cytospora canker fungus typically show scattered branch dieback, often starting on the lower branches. *We will never send you spam or share your info. As a result, they are stressed and more susceptible to fungal pathogens. I reached out to Linda Williams, Forest Health Specialist - Northeastern Wisconsin from the Wisconsin Department of Natural Resources to get her insight into the disease. The Cytospora fungus gains entrance into branches or twigs of trees through wounds or branch stubs. Website Log In4-H Staff Login, Submitted by Anonymous on Tue, 01/08/2019 - 11:42, About ISU Extension and Outreach: Harrison County, Iowa State University Extension and Outreach. var prefix = 'ma' + 'il' + 'to';

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