camellia leaves turning yellow - GARDENING
AOL: Why Your Plant Leaves Are Turning Yellow—and How You Can Fix It Why Your Plant Leaves Are Turning Yellow—and How You Can Fix It Camellia diseases include die back (causing stem cankers and the death of branches), petal blight (affecting the flowers), and occasionally root rot problems. A common occurrence in shade is algal leaf spot; a scruffy substance on the upper surface of the leaves that is unsightly but not harmful to the plant. Unless you're talking about a maple or elm tree in the fall, yellow leaves on plants are generally not a good sign and something you'll want to fix—pronto.
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But the reasons for the color change and the ... Northwest Florida Daily News: Funny looking growth on azalea and camellia leaves | Gardening