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Yellow leaves and black spot

stuarta99stuarta99 Posts: 235
in Problem solving
What's the best way of dealing with yellow leaves and black spot on roses? I'm determined this year to keep the leaves looking healthier and been hitting them with Rose Clear but I've just noticed it says only 4 times a year.

Posts

  • DovefromaboveDovefromabove Posts: 88,147
    Pick them off and destroy them. Don’t let them fall onto the ground where they can reinfect it. 
    They don’t look too bad at all. What variety is that?  Some roses are more resistant to black spot than others. 

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





  • stuarta99stuarta99 Posts: 235
    Yeah not too bad at the moment. So pick off and yellow and any green ones with black spots? Does it hurt regrowth of the rose by taking off the leaves?

    That one is called Rachel, we planted it when my gran Rachel passed away so I remember the name.

    Is it bad to use too much roseclear?
  • DovefromaboveDovefromabove Posts: 88,147
    edited May 2023
    The rose will grow new leaves, especially this early in the season. 

    I don’t spray anything … I’m very concerned about the damage fungicides are doing to our environment and the potential for damage to our health and that of the planet. 

    https://forum.gardenersworld.com/discussion/1069415/fungicides-now-are-we-going-to-take-this-seriously-i/p1 

    I’d rather grow resistant varieties, or put up with picking off the affected leaves and stop them falling to the ground where they can perpetuate the problem. 

    I’ve not used Roseclear in over 30 years … so I’m probably not the best person to ask … 🤔  or perhaps I am 😉 

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





  • NollieNollie Posts: 7,529
    There are a couple of other hygiene things you can do to help control it naturally..

    Clear away all that woody mulch and debris in a circle approx. 50cm diameter around the rose. Prune right back to soil level all those dead woody bits in the middle. Give it a really good deep drink then mulch all around it with a couple of inches of fresh compost to suppress spores in the soil. Keep clearing up any fallen leaves and picking off grotty ones. Don’t let other plants crowd the rose because this decreases air circulation and overhanging stuff can drip drip onto the leaves after rain, creating ideal conditions for fungal diseases to develop. 

    I love in a hot, humid climate with high black spot pressures. By doing all the above regularly I have managed to reduce the incidence of BS. However, the weather just works against you sometimes and this year has been bad for BS all over, by all accounts. I have roses with it this year that are usually clear.
    Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
  • stuarta99stuarta99 Posts: 235
    Ok thanks guys. I'll have to go out and pick them all off. They don't seem too bad at the moment but like to catch it as soon as I can. Hadn't even noticed the woody bits in the middle but again was going to pop out and tidy some of the others up to cut the non flowering stems - not sure if they will regrow.

    Going to freshen up the mulch bark next weekend so will pull some back. Gave them a good deep water last night, but they are all in full sun so planning on once a week maybe a couple
  • stuarta99stuarta99 Posts: 235
    Just gone out and removed the worst of them and noticed my neighbour, who always has lovely roses and very particular also has black spots so not just me  :)
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