White fungus on plants?

Posts

• Pete.8 Posts: 11,340

  October 2022

  It's mildew - a type of fungus.
  Many of my plants have it now too this year - it's weather conditions that cause it - hot and dry followed by mild and damp.
  It shouldn't have any long lasting effect and the plants should be fine next year - weather permitting.
  
  So your scabious can be planted out - I've also got one I bought recently that also has mildew and I'll be planting it out a bit later today
  
  Photos being rotated are due to this site not working properly  - it's been happening for years now.

  
  Billericay - Essex
  
  Knowledge is knowing that a tomato is a fruit.
  Wisdom is not putting it in a fruit salad.

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• Ann85 Posts: 64

  October 2022

  Pete.8 said:

  It's mildew - a type of fungus.
  Many of my plants have it now too this year - it's weather conditions that cause it - hot and dry followed by mild and damp.
  It shouldn't have any long lasting effect and the plants should be fine next year - weather permitting.
  
  So your scabious can be planted out - I've also got one I bought recently that also has mildew and I'll be planting it out a bit later today
  
  Photos being rotated are due to this site not working properly  - it's been happening for years now.

  Thank you for this! Great then I will plant it out while it is warm and wet so it can get its root growing before winter. I suppose that’s the positive aspect of this weather 🙂

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• Plantminded Posts: 3,580

  October 2022

  This is powdery mildew, and very common after the sort of weather we've been having, as @Pete.8 says.  I'd be inclined to remove the worst infected leaves as the spores are likely to overwinter and become active again next year.  When planting out, try to place your plants in a sunny position and give them a bit of space to ensure good air flow to reduce the humid conditions that encourage the mildew to spread.  The mildew can be plant specific and confined to certain plants, thus unlikely to spread throughout your garden.  This RHS link gives more information, but try to avoid using fungicide if possible: Powdery mildews / RHS Gardening.  I've read somewhere that diluted milk applied as a foliar spray can help but have never experimented with this!

  Wirral. Sandy, free draining soil.
  
  
  

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• Ann85 Posts: 64

  October 2022

  Plantminded said:

  This is powdery mildew, and very common after the sort of weather we've been having, as @Pete.8 says.  I'd be inclined to remove the worst infected leaves as the spores are likely to overwinter and become active again next year.  When planting out, try to place your plants in a sunny position and give them a bit of space to ensure good air flow to reduce the humid conditions that encourage the mildew to spread.  The mildew can be plant specific and confined to certain plants, thus unlikely to spread throughout your garden.  This RHS link gives more information, but try to avoid using fungicide if possible: Powdery mildews / RHS Gardening.  I've read somewhere that diluted milk applied as a foliar spray can help but have never experimented with this!

  Yes thanks I read this about milk spray and how it has to be in the sun light / strong sun to be activated. I did try it on other Dahlias this summer using a mixture not very diluted and it seemed to hold the mildew at bay but the conditions just continued so long! Yes I think the scabious was in a big gathering of plants in pots and got crowded without much air flow. I do have another scabious elsewhere not near where I’m planting it so fingers crossed it doesn’t spread! 

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