The black sooty substance on top of leaves and bark is sooty mold feeding on honeydew. The powdery white spots underneath are likely the insects themselves (scale, aphids, or mealybugs) or their waxy coverings.
It’s unsightly but not a direct disease of the camellia.
Elm Tree with Peeling Bark and Defoliation: Insect Feeding Likely
Lemon Tree Leaf Curl and Yellowing in Madrid: Environmental Stress
Toothache Tree Decline: Mystery Dieback in Containers—Organic Neem Protocol
Jasmine Leaf Damage and White Blobs: Grasshoppers/Slugs and Mealybugs
Honeysuckle Destroyed by Caterpillars: Hand-Pick or Bt
Sooty Mold on Camellia Caused by Scale Insects
Camellia 'Jury's Yellow' Sooty Mold: Same Insect Cause
Phalaenopsis Orchid Crown Rot: Likely Fatal
White/Gray Leaves on Japanese Red Maple: Need Photo
Sticky Leaves and Brown Nodules on Jade Plant: Scale and Honeydew
Lilac Leaf Spots and Curl: Need Photo for Accurate Diagnosis
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