By Janet1964
Essex,
United Kingdom 
my camaila has black soot on the leafs what is this and where does it come from
5 Apr, 2010
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Welcome to GOY Janet :)
There are likely to be sap sucking scale insects on the underside of the leaves.The sooty covering on the surface of the leaves is their deposits.
You will need to spray the undersides with an insecticide.
5 Apr, 2010