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The black spruce’s short, stiff, blue-green needles along its drooping branches are arranged in every direction on the tree's twigs. Its pine cones are small ... Being a semi-serotinous species, black ...

Colorado blue spruce (Picea pungens) is highly susceptible and is commonly affected ... likely to be infected with Rhizosphaera needle cast due to stressful conditions. Whenever possible plant spruce ...