Answered for Danville, Hendricks County (county seat) County.
Effectively endemic on Indiana blue spruce. It is the single most common reason a blue spruce gets removed here. In Danville, the Main Street Historic District developed circa 1844–1920 across just 9 acres and 37 contributing buildings, and the Courthouse Square district circa 1865–1960 over 70 acres — those blocks hold the town's oldest and largest trees on narrow lots with sidewalks on both sides. Danville does actively manage its right-of-way canopy through a standing Tree Advisory Committee, though the specific inventory and replanting-ratio requirements attributed to Chapter 97 could not be verified. Rhizosphaera needlecast is near-universal on mature blue spruce here.
The Main Street Historic District developed circa 1844–1920 across just 9 acres and 37 contributing buildings, and the Courthouse Square district circa 1865–1960 over 70 acres — those blocks hold the town's oldest and largest trees on narrow lots with sidewalks on both sides. Danville does actively manage its right-of-way canopy through a standing Tree Advisory Committee, though the specific inventory and replanting-ratio requirements attributed to Chapter 97 could not be verified.
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.
240 Old North Salem Rd, Danville, IN 46122
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1078 IN-236, Danville, IN 46122
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1502 S County Rd 525 W, Danville, IN 46122
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4883 Gibbs Rd, Plainfield, IN 46168
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278 N East St, Plainfield, IN 46168
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7701 S County Rd 375 E, Mooresville, IN 46158
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Distance measured from Danville.