The appearance of reated trees will ... fungicide, Ensign 720. This can also be helpful in large stands of trees that have grown into one another. Typically symptoms first appear on the lower branches of a tree and work from the inside of the tree out. Many trees recover from Rhizosphaera needle cast after 2 … Keep a close eye on existing trees. This will protect the needles from infection. The information contained within may not be the most current and accurate depending on when it is accessed. Preventative fungicide applications when needles are half grown and again when fully grown may help if the disease isn’t too severe. Some things to consider in keeping a spruce happy are; planting depth, watering practices, nutrients, soil type, location, spacing etc. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. 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). Fungicides do not cure needles already infected, but they protect the newest growth as it emerges. Send a sample in for diagnosis before you decide to spray. Will Bonide Liquid Copper Fungicide Concentrate work for yellow needle cast on blue spruce trees? Photo 4 shows the southern exposure of trees in the plantation. Ames, IA 50011-2031 When all other management is not enough, fungicides can be used to help manage rhizosphaera needle cast. The label will tell you whether a fungicide is labeled for your disease on your tree, application rates, and protective equipment to wear while applying the fungicide. Because the new growth emerges in the spring, the ideal time to spray conifers is coming up soon. Follow label directions exactly. In order for disease to occur three things need to happen; the pathogen needs to be present, the environment needs to be conducive for disease development and there needs to be a host that is susceptible to disease. Copyright © 2020ISU Extension and Outreach Treatments will not cure existing infections, but can prevent additional infections. The key to successfully managing this disease requires that you protect new growth as … Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. Back to IPM scouting in woody landscape plants. Sanitation Application to large trees requires special equipment to ensure adequate coverage. This article was originally published on April 18, 2007. Another key characteristic of needl… While spring may have long passed, it might not be too late for your trees to benefit from fungicide treatment this year, as it may still provide some reduction in the spread of the fungus to healthy parts of the trees. Rhizosphaera spp picnidia (the fungal fruiting structures) are sometimes visible using a hand lens for magnification. Note that trees that are infected with both diseases require a total of four sprays. Remember to always follow the instructions on product labeling. Fungicide treatments Rhizosphaera needle cast is the most common disease on spruce trees that is received in the Plant and Insect Diagnostic Clinic. This disease is common in the spring but we receive samples anytime throughout the growing season. Once a tree is diagnosed with Rhizosphaera needle cast, the management tactics aim to reduce the spread of the disease to healthy tissue. If the symptoms described above are noticed, examine the affected area carefully. 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