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What causes black spots on Red Robin leaves?

Our Advice:

Your Photinia has leaf spot disease. Control it with Fungus Fighter from Bayer or Fungus Clear Ultra from Scott's. This will protect the new growth but the spots will remain on the older growth. Also, apply a foliar feed like Seaweed Extract with Sequestered Iron from Vitax, as leaf spot is always worse on underfed plants.

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