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Boxwood Bark Issue: Canker vs. Scale Insects

Diagnosing 25-Year-Old Hedge Decline

A New Jersey gardener has fungus-like growth on boxwood bark killing sections of mature hedge.

Likely Insects, Not Disease

Ed Gulliksen suspects mealybug or scale (white, fluffy) mistaken for fungus. True bark canker shows sunken, split bark.

Treatment

  • Horticultural oil on bark – Controls scale/mealybug
  • Fertilize for strength – Supports recovery

Proper identification avoids unnecessary fungicide use.

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