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black coating on rhodo leaves

• Message 1. 

  Posted by peter sherrington (U15205497) on Tuesday, 27th March 2012

  I have recently found a black coating on the leaves of my rhodos, camilias and pieris plants in one bed in my garden. This bed is approx 40foot long and is north facing. All plants appear to be growing and flowering well but are unsightly to say the least. I live in Carlisle Cumbria and my soil is fairly well drained. Any sugestions to how I can get rid of this.

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• Message 2

  , in reply to message 1.

  Posted by AlinaW (U2220240) on Tuesday, 27th March 2012

  It is likely to be sooty mould. Insects on the underside of leaves, usually aphids or scale insect, suck the sap and excxrete a sticky substance known as honeydew. Mould spores land on this and establish themselves, and you get your black coating. You need to tackle the insects - have a good look at the underside of affected bushes, and any overhanging trees. Spray with Provado Ultimate Bug Killer to kill the insects, and a couple of weeks later you can wash the leaves of the mould, either with a hose or mild soapy water.

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