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Category Archives: Plant and Tree Disease

Everything You Need To Know About Needle Cast Diseases

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A number of needle cast diseases are affecting fir and spruce trees. Both Rhabdocline and Swiss needle cast can affect Douglas fir. On spruces, including Colorado blue and Engelmann, the needle casting disease is called Rhizosphaera. Rhizosphaera also affects white spruce and Norway spruce, but it is less common and generally only happens when they […]