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Needlecast (or needle cast) disease is a fungal disease that attacks a variety of evergreen trees, including spruce and pine trees.What causes Rhizosphaera needle cast?
Rhizosphaera needle cast is caused by the fungus Rhizosphaera kalkhoffii. The fungus survives winter on living and recently killed needles. In spring through early autumn, spores spread to new needles within the tree or in neighboring trees via splashing water. Needles are most commonly infected when they are young and still growing.How do you use needlecast spray?
Measure the recommended concentrate amount with the convenient measuring cap. Pour it into your sprayer, add the recommended amount of water, and mix well. Spray to cover all needle and branch surfaces until thoroughly wet. Begin needlecast treatments in spring when new needles are 1/2–2 inches long.Do needles fall off trees in the fall?
Discolored needles fall off in late summer to fall. Infected trees have few needles near the trunk and look thin, or see-through. Damage typically starts on the lower branches and moves up the tree. If the majority of needles are infected for 3 to 4 years in a row, the branch will die.