At M&M Tree Care, we’ll treat the tree for the fungus over the course of two years. Colorado and Engelmann spruce are very susceptible, but Norway and white spruce are somewhat resistant. Colorado blue spruce is the primary host. We think it is Rhizosphaera needle cast. Needle cast is a broad group of fungal diseases that cause conifers to shed needles. Last year we cut off the infected areas and cleaned up the ground around the tree. In late summer, needles yellow, then turn purple-brown, dropping by late autumn. The first application should occur when new needles are half elongated (around Memorial Day depending upon location) followed by a second application three to four weeks after the first. During the spring, we’ll spray the tree with a copper-containing fungicide designed to keep the rhizosphaera fungus from spreading. Thank you for contacting Toronto Master Gardeners regarding your spruce trees that have been affected by Rhizosphaera needle cast. Rhizosphaera kalkhoffii (fungus) Hosts. Spruce tree rhizosphaera needle cast diease treatment. Symptoms/signs. The symptoms of needle cast first appear on needles as light green to yellow spots, which eventually turn red or brown. Problem Info . We did not spay a fungicide. Rhizosphaera needle cast disease is caused by the fungus Rhizosphaera kalkhoffii Bubak. Young trees sustain the most severe damage, but trees of any size can be affected. Rhizosphaera Needle Cast. Analysis . Norway spruce is resistant. Asked January 26, 2017, 5:53 PM EST. General References: (General resources for Rhizosphaera kalkhoffii (Rhizosphaera Needle Cast - causative organism) which are not primarily for identification) Literature listed under the following higher taxa may be relevant to Rhizosphaera kalkhoffii (Rhizosphaera Needle Cast - causative organism): This shedding of needles can be more serious to conifers than losing leaves is to deciduous July 31, 2015 Cause. The timing of the two applications should be the same … Branches may die after 3 or 4 years of infection. Treating Rhizosphaera Needle Cast should always be done by a professional arborist. Damage starts on the inner part of the lower branches, progressing upward and outward so the bottom of the tree is bare and hollow. Rhizosphaera needlecast. 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. Other spruces and pines are infrequently attacked. Field identification is based on symptoms, but accurate identification requires laboratory analysis. We have approximately 36 spruce trees with various degrees of needle loss and discoloration. With a hand lens, you can see rows of black specks on the needles, where the pycnidia have emerged through the stomates of the needles. One of the three trees is in really bad shape, but the two other ones don't look too bad. Growth of the fungal pathogen from the spots on the needle will cause the death of the entire needle. We have been told by a licensed arborist that they are suffering from rhizosphaera needle cast diease and spider mites. I have attached pictures of the sick tree. We are planning on removing the tree that has been severely impacted this week. For Rhizosphaera needle cast, two properly-timed applications per year for at least two consecutive years (sometimes three) are required for control.

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