systemic rose fertiliser and control

Discussion in 'Rosa (roses)' started by madhatter, May 10, 2009.

  1. madhatter

    madhatter Active Member

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    Does anyone have an opinion about the systemic rose fertilisers and which may be best to prevent mildew and blackspot?
     
  2. Ron B

    Ron B Paragon of Plants 10 Years

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    Systemic pesticides work by being so poisonous they are able to cross even the barriers to chemicals a plant has, and make the plant sap poisonous to sucking pests. I would rather do without the plant than purchase, handle, apply and store something like this.

    Same with spraying fungicides. If a rose or any other plant is spoiled by leaf fungi, I get rid of the plant.

    End of problem.

    During 2004 The Plant Locator - Western Region (Black-Eyed Susans/Timber, Portland) listed something like 50,000 kinds of plants being offered here. Even allowing for synonyms (more than one name being listed for the same item), that leaves a lot to choose from, and little if any need to struggle with problem-prone selections. There are even disease-resistant modern hybrid bush rose cultivars.
     
  3. janetdoyle

    janetdoyle Active Member 10 Years

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    Maybe this will inspire me to get rid of my New Dawn which is now suffering mildewed leaves in a too-protected area of my patio -- not enough air circulation owing to the fence, I am guessing, plus a period of deep shade. In Nova Scotia I grew New Dawns magnificently in partial shade and not a spot of mildew. I will now look for a replacement climber and see if I can avoid using fungicides.
     
  4. Ron B

    Ron B Paragon of Plants 10 Years

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    Actually it's the drying of the soil by the concrete foundation. Watering more often might take care of it.
     
  5. janetdoyle

    janetdoyle Active Member 10 Years

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    But we have special irrigation, that mini drip irrigation to the roots -- my goodness, more water? I do grant that there is a lot of drainage there, but I planted the roots out further about 2 feet at least away. I think it is the moisture in the air, the lack of breezes... or something. A clematis in the patio suffered from mildew also. There are certain challenges to this West Coast gardening...
     

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