Agriculture and Agri-Food Canada – Rhizosphaera needlecast, University of Wisconsin Extension – Rhizosphaera Needle Cast, International Society of Arboriculture (ISA) – Ontario Chapter (‘Find an Arborist’ resource coming soon), 777 Lawrence Avenue East Toronto, ON, Canada M3C 1P2 | Phone: 416-397-1345, Copyright © Toronto Master Gardeners 2019, Gardening Guides provide introductory information on a broad range of horticultural topics. 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. From that point you can search by applying your zip code: You may also consider sending a sample to MSU Diagnostic Lab. The symptoms are similar and the fruiting bodies could be confused for those of Rhizosphaera. Setomelanomma - Very little is known about this pathogen. Stigmina - Very little is known about Stigmina. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. For effective control, infected trees should be treated once in mid-May and … Stigmina and Rhizosphaera Needle Cast in Trees. Fungicides are available.More information and photos can be found at this website. I have included a brief explanation of treatment from the following link. For a proper diagnosis you may want to consider consulting with a certified arborist in your area. I hope this information helps you out in making the right decision and if you have any further questions please don't hesitate to ask. Canker - This fungus disease tends to infect older spruce trees. The white resin on the branches will resemble bird droppings. It is important to get a proper diagnosis on what is causing the damage before applying any chemical or fungicide. 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. Links to other issues that plague Blue Spruce trees. If you have seen trees affected by needle cast disease in the area, avoid planting this highly susceptible tree. The most common disease of blue spruce is Rhizosphaera needle cast, a fungal disease that usually requires fungicides for management when it occurs. 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. Also, another prevention strategy for landowners to use is to prune the lower branches of their spruce. I hope this information helps you out in making the right decision and if you have any further questions please don't hesitate to ask. Unfortunately the controls for Rhizosphaera do not appear to be effective for Stigmina. A certified arborist can diagnose your tree and make the necessary recommendations. At planting time, landowners should consider trees other than blue spruce, since it is prone to infection by Rhizosphaera. Plant & Tree Insect Protection This store is currently not accepting online orders. Rhizosphaera needle cast causes needles to turn purplish brown and fall from the tree, usually from the inside of the tree working out and from the bottom of the tree working up. A lot of time and money has been wasted by applying fungicides at the wrong time. Make a fungicide solution by infusing 3 ounces of minced garlic in 1 ounce of mineral oil for at least 24 hours. 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. You may begin to notice branches dying near the base of the tree first and eventually see it progress upward. If unsure whether a spruce has a needle cast disease or another disease, consider consulting with your local county agent.

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