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White splashed cosmos

My huge cosmos plants have suddenly developed white spashes on the foliage. It almost looks like they have been spattered with white paint!

i can't see any evidence of bugs of any sort - and the plants are still beautifully healthy and producing hundreds of flowers.

Is this caused by a deficiency of some sort or maybe a fungus or blight?



  • punkdocpunkdoc Posts: 13,726

    Looks like splashes caused by weed killer.

    How can you lie there and think of England
    When you don't even know who's in the team

    S.Yorkshire/Derbyshire border
  • Thanks punkdoc - but definitely not weedkiller.

    I don't use anything like that in my cutting patch.  have attached a couple of photos showing some of the plants imageimagein case that helps someone identify the problem.

    thanks in advance!

  • DovefromaboveDovefromabove Posts: 83,925

    image  Powdery mildew?

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • One of my cosmos plants looks the same.I put it down to my young grandson spraying it with the hose pipe in very sunny weather. Mine look like sun scorch patches The plants next to it escaped with only very slight damage. The new leaves produced since then are perfectly ok. He thought he was doing me a favour bless him. Hope yours will be ok. 

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