Is my honey locust dying or just stressed?
One limb yellowing and wilting out of season while the rest of the canopy looks fine is the Thyronectria pattern — cut the bark on that limb and look for a sunken canker with reddish-brown discolored wood underneath. Whole-canopy thinning by August is usually mimosa webworm defoliation instead, and that tree will releaf next spring; the cankered one loses another limb every year until it is girdled.
Why honey locust ends up on a quote here
This became the default replacement tree after emerald ash borer cleared the ash, and central Indiana now has street after street of it — which is the problem. Extension pathologists have warned for decades that honeylocust's pest and disease list turned serious precisely because it was overplanted, and a monoculture block moves mimosa webworm, mites, and canker through in a hurry.
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