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Powdery mildew

overlordoftheringsDBPQ2yKToverlordoftheringsDBPQ2yKT Posts: 1
in Problem solving
Hi, I have resilient powdwry mildew on rambling and climbing roses on East facing wall. Organic measures and regular garden fungicides (rose clear ultra, provento plus, copper, sulphur)have had little effect. Recently I came across bbc suggestion to use flutriafol, but cannot find this online or at local stores. Any suggestions on where it may be available and how to apply it?

Posts

  • ObelixxObelixx Posts: 30,090
    Can't help with chemicals as I don't use them but could it be a cultivation problem?

    Lack of ventilation and over crowding are common causes of powdery mildew so can you perhaps thin the plants out a bit, make sure there's space for air flow between the plants and the wall, remove and destroy all affected stems and leaves, feed the plants a good mulch of manure or similar in autumn and spring to help them grow strongly? 
    Vendée - 20kms from Atlantic coast.
    "The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
    Plato
  • DovefromaboveDovefromabove Posts: 88,147
    edited April 2021
    As well as agreeing with everything that @Obelixx has said above, I would add ‘water generously’. 

    The area at the foot of a wall can be quite dry, even after rain, because of the ‘rain-shadow effect’  and also because the footings of a wall act like a sponge and soak up water from the soil. 

    I have found over the years that plants tend to succumb to powdery mildew when they are stressed, particularly by being too dry at the roots. 

    Don’t buy fungicides .., save your money and give it to your water provider instead 🚿 😉 

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





  • UrbanNoviceUrbanNovice Posts: 29
    edited April 2021
    I had a bay that had what looked like a fungal infection - possibly powdery mildew. I found a recipe somewhere online and sprayed it liberally with this twice a day for 5-7 days and it cleared up. I was sceptical but pleasantly surprised. The recipe:

    Per liter of water (shake thoroughly before each spay)
    5 g sodium bicarbonate
    5 ml olive oil
    1 drop washing up liquid
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