Roses forum: David Austin Roses blooms are deformed with a brown area

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Name: Beverly Shotzberger-Harmon
Staunton VA (Zone 6b)
Baci5
May 21, 2017 5:06 PM CST
Two of my David Austin roses are producing buds and flowers that have a brown, rotten area. It tends to be off center. I can not find any information as to the cause of the problem and my local nursery doesn't have a cue. Can anyone help me? This is only my second year with these beauties.



Thumb of 2017-05-21/Baci5/ec6f04




Thumb of 2017-05-21/Baci5/220625

Name: Porkpal
Richmond, TX
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porkpal
May 21, 2017 5:19 PM CST
Odd. It almost looks like the bud starts to open normally then "balls". Has it been very wet there?
Porkpal
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
May 21, 2017 6:13 PM CST
Welcome!

I would wonder about thrips. If you tap an affected bloom on a piece of white paper do you see any tiny elongated insects come out?
Name: Suzanne/Sue
Sebastopol, CA (Zone 9a)
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Calif_Sue
May 22, 2017 12:40 AM CST

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Name: Steve
Prescott, AZ (Zone 7b)
Region: Southwest Gardening Roses Irises Lilies
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Steve812
May 22, 2017 12:41 PM CST
This year I had an unusually severe attack of both aphids and thrips and the damage looked a lot like what's depicted. Most of my DA roses were either lightly affected (Lady of Shallott, Crocus Rose, and Tess), but Abraham Darby was severely affected. The flowers on AD were so severely deformed that they simply did not open. I had to remove dozens of them.



When you dance with nature, try not to step on her toes.
Name: Steve
Prescott, AZ (Zone 7b)
Region: Southwest Gardening Roses Irises Lilies
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Steve812
Jun 11, 2017 9:25 AM CST
It was more of a problem for fragrant roses than for roses with no fragrance. It was more of a problem for early blossoms - ones that occurred before thrips predators were well established in the garden for the season - than for later ones. It was more of a problem for roses with thin petals than for roses with thicker petals. By now very few new blossoms show damage.

I tried the blue stickies recommended elsewhere and I cannot say I found them to help much. The labels suggested that they are for "monitoring populations" of thrips. I will not use systemic insecticides of hundreds of roses, since I have no info on how this will affect the local population of thrip and aphid predators. So I'm resigned to losing a large number of early blossoms to this sort of thing. This means more work, as I will have to water my roses more to stretch out blooming season...

My cunning plan for next year - if I can remember - is to try dusting the buds of the most desireable roses (to thrips and aphids) with pyrethrum or with diatomaceous earth.
When you dance with nature, try not to step on her toes.

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