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Powdery mildew

myclayjunglemyclayjungle Posts: 162
in Problem solving
Any tips for getting rid of it on courgettes, mange tout and squash?  I sprayed pravanto fungus fighter 3 days ago- and can see no difference at all.   Will it remove existing fungus- or just prevent it on new leaves?
Coastal Suffolk/Essex Border- Clay soil

Posts

  • B3B3 Posts: 27,505
    Powdery mildew is caused by a lack of water. I would remove the worst affected leaves and give the plants a good soaking and then keep them well watered - if you can😕
    In London. Keen but lazy.
  • Arthur1Arthur1 Posts: 542
    Fungicides tend to be preventative not curative. They coat the leaves and prevent fungal spores from germinating. Once the fungus has a hold it will be difficult to eradicate but you could spray new foliage not yet infected.
  • bertrand-mabelbertrand-mabel Posts: 2,697
    But spraying onto plants that are edible.. is this a good thing
  • Arthur1Arthur1 Posts: 542
    I suspect a lot of what is bought from supermarkets has been sprayed. Think of those huge crop sprayers you see in fields over summer. Personally I don't spray and grow as organically as possible but 'each to his own'.
  • myclayjunglemyclayjungle Posts: 162
    Thankyou everyone.  Yes, its been incredibly dry here and I water daily, if not twice daily.  Some plants are in large pots due to house renovation and majority of garden being rubble and diggers. Some are in the ground.

    @Kate 7.  I initially followed advice online for an organic option using milk and bicarb spray.  The milk clearly went rancid and stank, attracted flies and 2 days later- the plant stalk bent in half and fell out of the pot!  I then followed the RHS advice on using the pravanto spray- which can be used on edibles. If you could recommend an organic solution- please tell me what you'd advise, as that would be my preference too?
    Coastal Suffolk/Essex Border- Clay soil
  • Arthur1Arthur1 Posts: 542
    I don’t spray fungicides, organic or not, in my garden at all. I put up with diseases, attempt to minimise them or simply remove the plant.
    it must be remembered that organic sprays are usually broad spectrum. This means they kill a wide range of both beneficial and harmful organisms. But, as I said, each to his own. Some people swear by SB Plant Invigarator. Also Neem oil seems popular.
    Have you tried the bicarbonate with water not milk.?
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