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Herbicide Damage to Pin Oak from Weed-and-Feed

Dicamba/Triclopyr Root Uptake

Pin oak with rusty, yellow, wilted leaves after nearby weed-and-feed application. Broadleaf herbicides (dicamba, triclopyr) move through soil to tree roots. Roots extend 1.5× canopy width.

Remediation

Water heavily: 1 inch daily for 1 week, then every other day for 1 week to dilute herbicide. Future: use fertilizer only; spot-spray liquid herbicide for weeds.

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