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Renae and disease

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Posted by rosefolly Z9/S16 NCal (My Page) on
Mon, Sep 2, 13 at 15:23

My young plant of Renae has a fair amount of what I hope is juvenile powdery mildew and a touch of blackspot as well. Am I realistic in hoping that it will outgrow this tendency?

It certainly does want to bloom! I pick off flower buds almost daily.

Rosefolly

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RE: Renae and disease

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I have primarily observed Renae in warmer areas where she has no disease issues. You're correct that juvenile plants are much more prone to infections, much like juvenile people and animals can be. Getting her foliage up into the air where there should be greater air circulation should also help. My gallon, own root plant has a touch of mildew at the moment, too, but it's also "protected" by many other potted, younger plants in the front walled garden where I can mitigate the extreme heat and keep it watered better. It only receives three to four hours of "direct" sun there, though filtered through a lot of other foliage. I'm not surprised nor worried about the infection as it isn't severe and the conditions under which it has occurred are far less than "ideal". I'm confident she will outgrow it once she's planted in a better place. I wouldn't worry about your plant's issues. I honestly believe you will see dramatic improvements with maturity. Kim

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RE: Renae and disease

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We have Powdery MIldew here so seldom. This summer with more damp mornings and warm days I've seen more, but not on our two mature Renaes. I think Kim is right about it growing up taller and resisting disease more.

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RE: Renae and disease

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My fingers are crossed. The young 'Lady Hillingdon' shrub got blackspot its first year but not the second or third, so I am hopeful.

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RE: Renae and disease

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My planted winter band of Renae is totally green and clean unlike many others.

BUT she is also where air flow is certainly not an issue, she gets a bit of sun protection, but can get a lot of air too. (enough air I had to replace the wooden posts on my standards with metal pipes driven a couple of feet in the ground. We had such strong winds earlier in the season we had to tie up a few of them to the fence)

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RE: Renae and disease

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Different conditions, Kippy. Yours may be warmer, less damp or perhaps yours doesn't suffer as much water stress. Either cooler, damper, more restricted airflow or even greater water stress can all help induce mildew when and where you wouldn't think it should happen. Kim

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RE: Renae and disease

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My Renae is in full sun with excellent airflow, so it is very well sited. The summer days here range from warm to hot, but at night it usually cools down a great deal. It is beautiful for sleeping without the air conditioning so I love it, but this does foster powdery mildew in any plant so inclined.

Rosefolly

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RE: Renae and disease

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Up until the last 10-14 days, we had fog until noonish and highs in the 70's.

My Renae with one cane that is about 4+ feet tall (she has may others) is less than 8 feet in the same bed as a standard of Iceberg who gets more sun and a bit of mildew. 30 feet past them in the wind tunnel and in the shade are a pair of Icebergs standards that had a lot of mildew, did not stop them from blooming. Weeping China doll had a touch of it too. The front yard is not nothing but mildew, all the rest of the roses did well.

My only point is that a bit bigger Renae might have grown up past the mildew issue. Mine also was very happy to be out of the pot and in to the ground

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