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Disease on plants.

Jenny128Jenny128 Posts: 22
edited March 2018 in Problem solving


  • Jenny128Jenny128 Posts: 22
    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?
  • DovefromaboveDovefromabove Posts: 82,740
    A bit of a long shot, but are there any large sycamore trees nearby?
    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh

  • 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?
  • pbffpbff Posts: 433
    Hi @Jenny128,
    Your problem is sooty mould.
    More info here on the Royal Horticultural Society's website:

    Hope this helps.

  • BobTheGardenerBobTheGardener Posts: 11,391
    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.
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