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Could any helpful soul help identify this affliction on a friend’s hydrangea? Many thanks.


  • Apologies for the shouty heading  - that was supposed to be the comment!
  • josusa47josusa47 Posts: 3,530
    It's not clear from the picture whether the white blobs are outgrowths from the stems, or something that's attached themselves.  Have you tried picking them off, and if so, what do you find underneath?  My guess would be scale insects, but I'm sure someone better-informed will be along soon.
  • BorderlineBorderline Posts: 4,700
    I agree, it's scale insects on the hydrangea. See the link for more advice.

  • Yup scale insects, mine were infested a couple of years ago. Clean them off the stems as best you can as they zap the strength of the plant. Good luck it’s tedious but mine came back ok the following year.
    Marne la vallée, basically just outside Paris 🇫🇷, but definitely Scottish at heart.
  • Thank you so much josusa, borderline and jacqui on behalf of my fellow garden course student Michael! I shall pass this on.
  • B3B3 Posts: 26,455
    A soft toothbrush is a good tool
    In London. Keen but lazy.
  • LynLyn Posts: 22,859
    No need to buy fancy plastic spray bottles, you can paint on methylated spirit with a paint brush. My parents used that method for years and so do I.
    Gardening on the wild, windy west side of Dartmoor. 

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