st, patrick's dying buds

andrearkJune 7, 2014

St Patrick's buds never fully open. They are wrinkled and deep brown at the base. When I remove the petals the core is dead and blackened. I can see no bugs.

I am trying to attach a photo.

Help anyone?

andreark

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NOACCEPTANCE772(8a)

Are you in the UK? Because this problem seems to be going rampant in Nottingham!
Florist roses, garden roses, all sorts of HTs are getting this :(
To be honest, I was just about to start a topic on this!
This same thing happened to my "National Trust" HT :(

    Bookmark   June 8, 2014 at 5:04AM
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andreark

Not exactly UK. I'm in California....

So what is it?

andreark

    Bookmark   June 8, 2014 at 11:20AM
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seil zone 6b MI

I hope someone has a answer for this because it's quite puzzling. Have you had hot dry weather, Andrea?

    Bookmark   June 8, 2014 at 11:53AM
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andreark

Thanks Seil.

Yes we have had hot dry weather BUT none of my other roses, HTs or Austins, have been afflicted. I hand water the raised bed that St. Patrick is in. (It is raised but built over soil) If I had omitted watering for this plant, would this happen? I water 2 or 3 times each week. So the most this plant, if I missed it, would have gone without water is less than a week.

andreark

    Bookmark   June 8, 2014 at 12:31PM
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tropical_thought(San Francisco)

It could be Botrytis Blight (Botrytis cinerea), I have this problem and I am in California.

    Bookmark   June 8, 2014 at 12:48PM
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andreark

Thanks for your answer TT. I looked up Botrytis Cinerea and the sites that had info on it said that there is an accompanying grey mold. I have no mold, the buds just
shrivel and die. And the center turns black.

andreark

    Bookmark   June 8, 2014 at 2:11PM
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kentucky_rose zone 6

Take some to the County Extention office. Let us know when you get an answer.

    Bookmark   June 9, 2014 at 6:57PM
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michaelg(7a NC Mts)

Botrytis normally affects the outer petals most. On flowers it produces brown rotten spots, not usually noticeable gray fuzz, I have never seen or heard of the problem you describe on a HT. Some cluster-flowering roses abort some buds for mysterious reasons. The neck tissue turns reddish and then yellow.

    Bookmark   June 10, 2014 at 10:18AM
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andreark

Thanks Michael and Kentucky.

I removed all the affected buds. I'll just have to see if it returns.

andreark

    Bookmark   June 10, 2014 at 10:24AM
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