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Herbicide Damage to Weeping Willow from Pond Treatment

Diagnosis

Over-application of simazine or Karmex (diuron) to the pond likely damaged the willow’s roots on the water-facing side. These herbicides are root-absorbed and can kill non-target trees.

Outlook

No antidote exists. The tree may survive if the undamaged side maintains enough foliage. Willows are resilient and may regrow. Future pond treatments should use herbicides labeled safe for adjacent trees.

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