Even though fungicide application will effectively control this disease, reinfection may occur in subsequent years. Rhizosphaera starts on the inner and lower growth and progresses upward through the tree. This may be extremely difficult with large trees. Instead, consider planting Norway spruce, which is resistant. Application to large trees requires special equipment to ensure adequate coverage. For fungicide treatments to be effective, thoroughly cover all needles. At M&M Tree Care, we’ll treat the tree for the fungus over the course of two years. How do I avoid problems with Rhizosphaera needle cast in the future? The first spray should be applied when new needles are half the length of the mature needles. It is most common in trees growing outside of their native range. Rhizosphaera needle cast (Rhizosphaera kalkhoffii) is a foliar disease of spruce trees. It can take up to 15 months for the needles to show visible symptoms after the initial infection. Thank you for contacting Toronto Master Gardeners regarding your spruce trees that have been affected by Rhizosphaera needle cast. If rhizosphaera is present, chlorothalonil can be sprayed twice in the spring to protect new needles. Chemical controls registered for Rhizosphaera needlecast control include fungicides containing chlorothalonil. White spruce and other conifers, like pine and fir, are also susceptible. Rhizosphaera needle cast may be controlled in one year if fungicides are applied correctly. Stigmina and Rhizosphaera Needle Cast in Trees. Treating Rhizosphaera Needle Cast should always be done by a professional arborist. If you have seen trees affected by needle cast disease in the area, avoid planting this highly susceptible tree. The first step is to get a reliable diagnosis. During the spring, we’ll spray the tree with a copper-containing fungicide designed to keep the rhizosphaera fungus from spreading. A second spray should be applied 3-4 weeks later or as prescribed on the fungicide label. The first application should occur when the new needles are half elongated (50% elongation relative to previous years’ needle length). 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. However, severely infected trees usually require two or more years of fungicideapplications. Apply as per label instructions beginning in spring when new shoot growth is 1 to 5 centimetres in length, and again several times at 3-4 week intervals until conditions no longer favour disease development. For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years, and sometimes three years, is required for control. These diseases primarily affect blue spruce. Be sure to read and follow all label instructions of the fungicide(s) that you select to ensure that you use the fungicide(s) in the safest and most effective manner possible. Needle cast diseases can be effectively controlled with fungicides containing chlorothalonil. To help you save money, time and the environment, it is important to monitor for the amount of needle cast in your plantings before initiating a spray program. ... selection (Photo 4). Blue spruce in Michigan suffers from a serious needle casting disease caused by the fungus Rhizosphaera. The first step is to get a rhizosphaera needle cast fungicide what and when to spray diagnosis needlecast control include fungicides containing chlorothalonil serious casting. Even though fungicide application will effectively control this disease, reinfection may occur in subsequent years weeks later or prescribed. 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