Answered for Sheridan, Hamilton County.
Effectively endemic on Indiana blue spruce. It is the single most common reason a blue spruce gets removed here. In Sheridan, community Park is singled out in the town's comprehensive plan for its numerous old-growth trees, and the pre-1970 residential grid around it carries matching full-size shade trees. New subdivisions plant only from the UDO's approved street-tree list — columnar Norway and hedge maples, black gum, disease-resistant Asian elm hybrids, European and American hornbeam, male "Autumn Gold" ginkgo and golden rain tree — a list that pointedly contains no ash and no Callery pear. Rhizosphaera needlecast is near-universal on mature blue spruce here.
Community Park is singled out in the town's comprehensive plan for its numerous old-growth trees, and the pre-1970 residential grid around it carries matching full-size shade trees. New subdivisions plant only from the UDO's approved street-tree list — columnar Norway and hedge maples, black gum, disease-resistant Asian elm hybrids, European and American hornbeam, male "Autumn Gold" ginkgo and golden rain tree — a list that pointedly contains no ash and no Callery pear.
Needles browning and dropping from the bottom of the tree upward and from the inside out, leaving bare lower limbs.
Rhizosphaera needlecast is near-universal on mature blue spruce here. Fungicide can hold the line on a tree that still has most of its canopy; a spruce that's bare halfway up is not coming back, because spruce doesn't refoliate old wood.
Two fungicide applications in spring, repeated for two to three consecutive years. Miss a year and it resets.
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Distance measured from Sheridan.