Cheshire,
United Kingdom 
My camelia is at least six years old
and has flowered beautifully all that time this year it is liiking a little sad and has what look like white insect casing all over the underside of the leaves , also my ohter 2 camelias that are in pots are not doung well either.
8 Jul, 2010
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Could be scale insect - spray with Provado, they make one specifically for scale I believe.
8 Jul, 2010