By Bambi6
East Sussex,
United Kingdom 
The leaves are covered in what appears to be a coating of black soot which rubs off to expose the green leaf and the underside has little black dots on any idea what it is and what treatment i can give The bushes are at least 20 yrs old ???
On plant
Rhododendron
12 Apr, 2010
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Sooty mould, usually caused by greenfly leaving sap on the leaf surface for the mould to grow on. Clear the aphids and use a fungicide on the mould.
12 Apr, 2010