Answered for Shelbyville, Shelby County.
Effectively endemic on Indiana blue spruce. It is the single most common reason a blue spruce gets removed here. In Shelbyville, shelbyville is the only town of its size around here with real canopy data coming: the Planning Department hired Davey Resource Group under an Indiana DNR grant to inventory every tree on city property and in the public rights-of-way from April through Memorial Day 2025, recording species, size and health, flagging invasives, and marking dead or hazardous trees and stumps for removal. Age tracks the housing rings — full-size canopy over the 1853-1939 Westside and the 1950s additions, and by inference much younger stock on recently annexed ground north of the city — with ash functionally absent after emerald ash borer reached all 92 Indiana counties by 2017. Rhizosphaera needlecast is near-universal on mature blue spruce here.
Shelbyville is the only town of its size around here with real canopy data coming: the Planning Department hired Davey Resource Group under an Indiana DNR grant to inventory every tree on city property and in the public rights-of-way from April through Memorial Day 2025, recording species, size and health, flagging invasives, and marking dead or hazardous trees and stumps for removal. Age tracks the housing rings — full-size canopy over the 1853-1939 Westside and the 1950s additions, and by inference much younger stock on recently annexed ground north of the city — with ash functionally absent after emerald ash borer reached all 92 Indiana counties by 2017.
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 Shelbyville.