The white resin on the branches will resemble bird droppings. The key to successfully managing this disease requires that you protect new growth as … You may begin to notice branches dying near the base of the tree first and eventually see it progress upward. Make a fungicide solution by infusing 3 ounces of minced garlic in 1 ounce of mineral oil for at least 24 hours. 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 product we like is Natria Fungicide (find it here on Amazon) which seems to work on nearly any kind of outdoor fungus. Some diseases are treatable and some are not. Various online sources, including the ones cited below, suggest that appropriate fungicides can be applied every 3-4 weeks whenever conditions favour the spread of fungal spores – i.e. White spruce and other conifers, like pine and fir, are also susceptible. Chrysomyxa weirii: Destroy heavily infected trees. Spraying too early or too late will miss the stages when the tree can be protected from infection by the fungus. At planting time, landowners should consider trees other than blue spruce, since it is prone to infection by Rhizosphaera. 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. Rhizosphaera needlecast http://www.btny.purdue.edu/Extension/Pathology/PHM/BD/Rhizosphaera.htm Always follow label directions for rate, frequency and safety. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil… What fungicide? Only the needles on the tips of the branches will remain. Unfortunately the controls for Rhizosphaera do not appear to be effective for Stigmina. http://www.pestid.msu.edu/LinkClick.aspx?link=Factsheets%2fCytospora.pdf&tabid=218&mid=834 Phomopsis - The initial symptoms are very subtle, just a slight discoloration of the needles. 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. Spray the tree including the … Just make sure it is designed for use in the landscape, on trees and shrubs. Stigmina - Very little is known about Stigmina. It is quite effective. Also, another prevention strategy for landowners to use is to prune the lower branches of their spruce. Even though fungicide application will effectively control this disease, reinfection may occur in subsequent years. Identification of the different varieties in Spruce Needle Rust occurs mainly by looking at the differences in shape of the spores. 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. wet weather. How should I treat infected adult trees? I realize this is a lot of information but proper diagnosis is a key to successfully treating your spruce and maintaining its health. The following website gives some information on Stigmina. Symptoms of both needle cast diseases look similar to each other. 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 most common disease of blue spruce is Rhizosphaera needle cast, a fungal disease that usually requires fungicides for management when it occurs. Rhizosphaera needle cast is a common disease of spruce trees and affects all ages of needles. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. Visit us in-store, or to shop online choose another store. Fungicides are available.More information and photos can be found at this website. A certified arborist can diagnose your tree and make the necessary recommendations. The agent or the supplier of the sprayer may also be of help. 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. You may begin to notice branches dying near the base of the tree first and eventually see it progress upward.
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