Two separate injuries share one name. Spray damage is direct chemical burn: salty slush lands on twigs, buds, and evergreen foliage and desiccates the tissue, killing it outright on the exposed face. Soil damage is systemic: chloride is taken up and accumulates in leaves to toxic levels, while sodium displaces calcium and magnesium on clay particles and collapses soil structure, so the soil holds water the roots can no longer extract. The tree ends up drought-stressed in wet soil and poisoned at the same time. The soil version is the one that kills trees; the spray version disfigures and causes dieback. In Fishers — Sunblest Farms, Avalon and Brooks Chase included, that's normally a tree trimming job at $250–$1,400. Within weeks.
Why this comes up in Fishers
Fishers had 344 residents in 1960 and 2,008 in 1980; it grew 404% in the 1990s alone, from 7,508 to 37,835, and reached 98,977 by 2020. Outside the original Fisher's Switch village platted in 1872 there is essentially no pre-1980 housing stock, so the canopy is a single planted cohort roughly 20 to 35 years old — first-generation subdivision trees all hitting the wires, the roofline and the sidewalk at once.
Fishers's canopy
Fishers was not one of the 23 communities in Indiana DNR's street-tree sample inventory, so no verified species breakdown exists for the city. What is documented is that the Tree Board maintains a list of desirable and undesirable species and no species off that list may be planted as a street tree without special permission — the practical picture being a 1990s-2000s nursery palette in tight uniform age classes, with ash gone since EAB was confirmed in Indiana in 2004.
Hamilton County rules
Fishers regulates street trees, not yard trees. Under section 95.33 you need a Tree Board permit to plant, treat, spray or prune a street tree, and a separate permit to remove one, with no permit required in a genuine emergency; permits are reported to run up to 60 days with a 30-day extension on written request. Section 95.34 bars planting in any public right-of-way, required landscape easement or municipal property without a permit, and bars planting within 15 horizontal feet of an overhead utility line or five feet of an underground one. The trap is the definition: STREET TREES covers trees on real estate owned or controlled by the city AND trees within a dedicated landscape easement, which sweeps in subdivision frontage that looks like private yard. Removing a tree standing entirely in a private yard needs no permit. Section numbers, permit durations and setbacks here should be confirmed against the current Fishers code before they are relied on.
The tree lawn in Fishers
This is where Fishers diverges sharply from Indianapolis. Section 95.02 puts maintenance and removal of the tree between the street and the sidewalk or right-of-way easement line on the owner of the adjacent property, and if that owner fails to remove a dead tree or dangerous limbs after notice, the city removes them and bills the owner. But the code points both directions on cost — 95.34(D) commits the city to street tree care within the Tree Board's budget while 95.34(F) assigns owners routine care between road surface and sidewalk. Call the Department of Permitting and Inspection before assuming who pays for a removal.