The following website will give you details on this condition and with pictures that will help you determine if your Spruce is dealing with this condition. http://web2.msue.msu.edu/bulletins/Bulletin/PDF/E2417.pdf Stigmina - Very little is known about Stigmina. Rhizosphaera is a fungus disease that tends to infect inner needles first. …………..Early identification of the disease can prevent extensive damage to individual trees and prevent the spread to adjacent trees. A lot of time and money has been wasted by applying fungicides at the wrong time. Setomelanomma - Very little is known about this pathogen. Other websites with excellent information on Rhizosphaera Needle Cast: http://ohioline.osu.edu/hyg-fact/3000/3059.html andhttp://www.pestid.msu.edu/LinkClick.aspx?link=Factsheets%2FRhizosphaeraCS3.pdf&tabid=218&mid=834 As I mentioned eairler there are many issues that spruce trees encounter and I am including addition al information with a brief explantion regarding them. Another key characteristic of needl… In the spring new shoots will expand and then rapidly wilt and die. For best effectiveness, fungicides should be applied when the emerging needles are half elongated (1/2 to 2 inches in length). We had a quote from an arborist (very expensive) who recommended that they spray in August and again in September this year and then continue 3 times per year over the next 3 years. Click or tap to zoom. Fungicides are available.More information and photos can be found at this website. If unsure whether a spruce has a needle cast disease or another disease, consider consulting with your local county agent. The agent or the supplier of the sprayer may also be of help. Call 517-355-4536 for sample instructions and fees or visit their website at: http://pestid.msu.edu Since your question referred to treatment of “needle cast” I will include information regarding Rhizosphaera needle cast. The following website gives some information on Stigmina. It is important to get a proper diagnosis on what is causing the damage before applying any chemical or fungicide. Links to other issues that plague Blue Spruce trees. Even though fungicide application will effectively control this disease, reinfection may occur in subsequent years. Rhizosphaera needlecast In conjunction with the use of fungicides, mowing of grass around the trees to keep humidity levels low, removal of all fallen needles away from the base of tree (to reduce levels of the pathogen), and avoiding pruning or shearing of trees during wet weather ( to avoid spreading spores of the fungus), will also reduce the impact of needlecast disease. Hello, There are several fungal issues and diseases that Colorado blue spruce trees can develop over time that will result with needle loss and dead branches, Rhizospera needle cast is just one of them. We missed that opportunity this year and are wondering if spraying trees now is waste of time, effort and money (Daconil) or if it would still protect this year’s growth to some extent. Please let us know what course of action you would recommend. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil… The product we like is Natria Fungicide (find it here on Amazon) which seems to work on nearly any kind of outdoor fungus. Canker - This fungus disease tends to infect older spruce trees. A protective fungicide with the active ingredient chlorothalonil (sold as Multi- Purpose Fungicide, Daconil 2787, and others), Two-some, Spectro-90, or copper based fungicide can protect new growth and prevent new infections. The following website will give you details on this condition and with pictures that will help you determine if your Spruce is dealing with this condition. We have Daconil fungicide (Chlorothanolil) that we want to use on infected trees but we’re not sure if we should wait for the next Spring or spray now. The symptoms are similar and the fruiting bodies could be confused for those of Rhizosphaera. wet weather. Green Earth Garden Fungicide, 1-L (4) 3.5 out of 5 stars. Unfortunately the controls for Rhizosphaera do not appear to be effective for Stigmina. For further information on Rhizosphaera needle cast, see the NDSU Extension service publication PP-1276, “Spruce Diseases in North Dakota.” If a fungicide is used, be sure to read, understand, and … You may begin to notice branches dying near the base of the tree first and eventually see it progress upward. Apple tree rust, regular leaf fungus, even lawn fungus. Other websites with excellent information on Rhizosphaera Needle Cast: Links to other issues that plague Blue Spruce trees. The needles turn brown or purple and drop from the tree. If you have a good hand lens you can see the black fruiting bodies in the white bands of the needle. Just make sure it is designed for use in the landscape, on trees and shrubs. Eventually needles may turn brown or purple and drop. It is important to get a proper diagnosis on what is causing the damage before applying any chemical or fungicide. The following website provides more details and photos. For a proper diagnosis you may want to consider consulting with a certified arborist in your area. Unfortunately the controls for Rhizosphaera do not appear to be effective for Stigmina. You may also see a white resin on the trunk or branches. From that point you can search by applying your zip code: You may also consider sending a sample to MSU Diagnostic Lab. Plant & Tree Insect Protection This store is currently not accepting online orders. From that point you can search by applying your zip code: http://www.treesaregood.com You may also consider sending a sample to MSU Diagnostic Lab. In most instances, infected trees usually require two or more years of fungicide applications to allow infected needles to be shed, while new needles remain uninfected. If a fungicide is used, be sure to read, understand, and follow the labeled instructions to avoid injury to the tree, the environment, or yourself. Needles on infected branches will turn yellow, then brown and will drop by the end of summer. Needle blight and needle cast can be treated with a fungicide approved for fungal diseases on spruce trees.

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