Answered for Carmel, Hamilton County.
The main reason mature Scotch pine is disappearing from Indiana windbreaks and old Christmas tree plantings. In Carmel, carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it. There is no cure once symptoms appear.
Carmel Urban Forestry publishes an approved species list (last revised 3/28/2024) whose "Undesirable Trees" section reads like a field guide to what fills older Hamilton County streets: silver maple (shallow roots, weak wood), Callery pear, pin oak, red maple and all Fraxinus for emerald ash borer. Approved large street trees run to swamp white oak, bur oak, chinkapin oak, hackberry, male-only ginkgo, thornless honeylocust, Kentucky coffeetree, baldcypress and London planetree; note Callery pear is discouraged locally but is not yet banned in Indiana — 312 IAC 18-3-25 currently lists 44 species without it.
The whole tree browns in a single season, often starting on one side. Needles stay attached.
There is no cure once symptoms appear. The tree needs removing promptly — dead pines are a fire and fall risk, and the beetles that carry the nematode breed in the dead wood.
Remove and destroy infected trees before the following spring, when the beetles emerge.
152 Lotus Dr Apt 1, Carmel, IN 46032
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Distance measured from Carmel.