Hi, I have a problem with some sort of disease that is affecting several plants in my garden, namely, pieris forest flame, rhododendron and azalea - see photos. This was first noticed about 3 months ago and it appears to be getting worse. In some cases there are white blotches on the underside of the leaves. I have noticed that some of my fence panels adjacent to the plants are showing a similar problem. Has anyone any ideas what might be causing it and what I can do to eradicate it please?
Jenny, your pictures are very big, taking forever to load and I have pretty good b/band. Just resize and they will load instantly In the meantime can I refer you to the post "black soot" further down this page. Could this be your problem?
I agree with pbff, sooty mould which grows on the excretia of aphids, scale insects or other sap suckers and falls from (usually tree) foliage above. That's why Dove mentioned sycamore I think. Aphids on Lime trees are particularly infamous for covering anything below with this sticky, sugary liquid known as honeydew and on which the mould grows.
A trowel in the hand is worth a thousand lost under a bush.
Jenny128
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I have a problem with some sort of disease that is affecting several plants in my garden, namely, pieris forest flame, rhododendron and azalea - see photos. This was first noticed about 3 months ago and it appears to be getting worse. In some cases there are white blotches on the underside of the leaves. I have noticed that some of my fence panels adjacent to the plants are showing a similar problem. Has anyone any ideas what might be causing it and what I can do to eradicate it please?
In the meantime can I refer you to the post "black soot" further down this page. Could this be your problem?
Your problem is sooty mould.
More info here on the Royal Horticultural Society's website:
https://www.rhs.org.uk/advice/profile?PID=770
Hope this helps.
pbff