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Tar Spot Disease on Emerald Cedars, Not Pet Urine

Misdiagnosis Corrected

Black spots at base of new emerald cedar hedge in BC. Owner suspected cat urine (causes yellow/tan).

Actual Problem: Tar Spot Fungus

Usually on Norway maples (cosmetic).
On cedars: can be devastating.
Requires fungicide labeled for tar spot.

Action

Buy appropriate fungicide at garden center. Apply per label. Improve air flow. Monitor spread.

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