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Rose problems

• Message 1. 

  Posted by Aggie (U15173903) on Sunday, 4th March 2012

  Hopefully some of you experienced gardeners might be able to help with this.
  
  I planted a Zephrine Drouhin rose last year in a large pot. All good last year, and, its right, it has fabulous scent.
  
  However, now have problems with it, it seems to be growing well, but leaves look a little greyish, are turned slightly and have holes in them.
  
  I see some greenfly on it, could these be eating the leaves also?
  
  Thank you

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• Message 2

  , in reply to message 1.

  Posted by AlinaW (U2220240) on Sunday, 4th March 2012

  Does the greyish surface rub off? If so, you have mildew. This can mean that air circulation around the plant is poor, and/or that it is too dry. Treat by making sure that the pot is not short of water and with a fungicidal spray that you can buy in the garden centre.
  Greenfly - they don't eat the leaves, but suck the sap, so reducing the plant's strength. You need to get rid of them. You can buy a combined spray meant for roses that will treat the mildew and the insects - one such is "Roseclear". There are two versions, one ONLY treating insects - read the box carefully and make sure that you get the combined one.

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• Message 3

  , in reply to message 1.

  Posted by Goldilocks (U2169760) on Monday, 5th March 2012

  Zephrine Drouhin is a lovely rose, but sadly it has, over the years, developed a very high susceptability to disease and black spot, to the extent that it is now very unreliable. I have tried it several times, giving it an ideal spot, but it is still impossible to keep it healthy through a season.
  
  One fascinating thing about hybrid roses is that when they are first bred from seed and released for sale they are usually very disease resistant. Gradually over time a particular hybrid may suffer from a genetic mutation that damages its disease resistance, and when that happens, EVERY ONE of the roses with that name suffer the same mutation at the same time, no matter where it is in the world, as they are all clones of the original.
  
  Zephrine Drouhin is a very old rose, more that 100 years old I think, and should now be retired - there are other modern and healthy cultivars with the same lovely flower shape and fragrance.

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• Message 4

  , in reply to message 3.

  Posted by friedrich (U5507516) on Monday, 5th March 2012

  Goldilocks I agree fully with your last paragraph, I would go further, it should only be sold with a health warning.
  However, its proneness to disease is not due to a genetic modification, it always had the disease problems. What is a fact that roses do become susceptiable to fungal diseases because of different fungal disease strains occure, somtimes they are even imported and a particuar rose may no have the resistance to it.

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