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I'm afraid to ask what Rosette Delizy has

14 years ago

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She also has flowers that look like this.

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This is a fairly regular malady for her - hot or cold. We're always pretty humid, so... The difference now that it's cooler is that the buds are bigger, and they're really big. Sometimes the bud in Photo #4 will be just covered with the moldy, furry stuff. Yuck! Tell me what's wrong with Delizy, please. No other rose in my garden does this as bad as this, and most not at all.

Thanks!

Sherry

Featured Answer

jerijen

14 years ago

Sherry, does it happen all the time? Or just in certain seasons?
And how old is the plant?

I've not encountered a case of it this extensive.

Jeri

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Comments (6)

jerijen
14 years ago
Botrytis.

That's funny, Sherry.
If I don't remove guard petals, I can get this with Etoile de Lyon, or (in extreme conditions) the Cochets.
I have not seen it on RD.
Amazing what these climate-differences do.

Jeri
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sherryocala
Original Author
14 years ago
OK, I was afraid of that. What do I do about it? And why only this rose? I Googled it which didn't really help much. "Cool damp weather." And fungicides I never heard of. Do you think I should keep her and just get rid of the effected flowers right away? Can I spray like once and knock the fungus down for a while? Does it effect the entire bush, healthwise?

Thanks, Dr Jeri, I'm so glad you make house calls.

Sherry
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sherryocala
Original Author
14 years ago
I'm almost positive it happens in the summer. It's a pretty regular thing but like this time doesn't effect every flower. This rose has been in the green since March, 2008, and I don't think this was much of a problem the first year.

Sherry
0
jerijen
14 years ago
Well, no problem with this here, where, if it is humid, it is chilly.
You MIGHT try peeling off the outer [guard] petals, when you see this, to see if it will then open naturally.
I might be hopeful of it outgrowing the problem, when the plant is fully mature.

Jeri
0
york_rose
14 years ago
I also feel certain this is Botrytis cinerea, aka "Botrytis blight", aka "gray mold". As you read, typically it requires both wet conditions and also cool temps. I suspect (but am not certain) that if you have rainy summers with night temps. down in the 60's (or maybe even mid-70's if it's wet enough, but that's only a hunch), that might be cool enough for it to take ahold on petals that were vulnerable to it. It doesn't usually infect leaves, although it can infect very tender, young ones.

The spores are airborne, and they'll germinate anywhere there's plant tissue that's sufficiently tender for it, as long as there's enough water around (it really does like "wet"; in an outdoor garden night fog probably won't be enough if it burns off in the morning sun) and the temps. are cool enough for a long enough period of time. I suspect your summer nights are cool enough for the spores to get started.
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