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Black marks on leaves of rhododendron

lacartridgesAZyIGsslacartridgesAZyIGss Posts: 24
in Problem solving
Hi, I have an old rhododendron that flowered beautifully last year but now has black marks on the top side of the leaves (the marks seem to scratch off with my nail). I can't make my mind up if this might be sooty mold or a fungal disease. Anyone any advice? 

Thanks Louise 

Posts

  • FairygirlFairygirl Posts: 55,117
    Sooty mould by the look of it. 
    Have a look here for info
    https://www.rhs.org.uk/biodiversity/sooty-moulds

    You may have scale insect or similar, and that needs treated to prevent the problem. Sometimes these things happen if a plant is stressed in some way. 
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
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