Posted by LT on February 11, 2006, 6:37 pm
Hi,
I have a large Queen Elizabeth rose bush, it's probably 8' tall. Some
of the leaves are turning yellow. I have a picture of the underside of
these leaves here.
What is this and how do I 'cure' it?
Thanks in advfance,
Laura
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Posted by Timothy on February 12, 2006, 1:32 am
On Sat, 11 Feb 2006 15:37:01 -0800, LT wrote:
> Hi,
> I have a large Queen Elizabeth rose bush, it's probably 8' tall. Some of
> the leaves are turning yellow. I have a picture of the underside of these
> leaves here.
> What is this and how do I 'cure' it?
> Thanks in advfance,
> Laura
<sniped super long url>
This is rust. You will want to clean all fallen leaves from the flower
bed. Do not compost the infested leaves. Burn them, bag and trash them or
take them to a commercial composter.
To get rid of the rust you will want to get a fungicide that has copper or
sulfur. I tend to select copper spray during the growing season and sulfur
spray for domant spraying. I've had issues using sulfur on actively
growing plant. This maybe just my experience with sulfur.... or the lack
of, how ever you wish to view it.
Good luck.
--
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Posted by Snooze on February 12, 2006, 3:25 am
> Hi,
> I have a large Queen Elizabeth rose bush, it's probably 8' tall. Some
> of the leaves are turning yellow. I have a picture of the underside of
> these leaves here.
> What is this and how do I 'cure' it?
Looks like you have rust and black mildew. You didn't say if it's still
winter wherever you are. If so, prune back the plant, cut away the branches
that have the biggest problems, then spray with a dormant oil or fungicide.
(Not on a warm sunny day) Certain roses are prone to fungus and mildew
problems.
Also how is this plant being watered? Drip irrigation? or an area sprayer?
Try and reduce the amount of water that is sprayed onto the leaves, water
early in the morning rather then in the evening, so the leaves have time to
dry out.
Fungus spores are transferred via water droplets, so the less water on the
leaves, the better.
Posted by LT on February 12, 2006, 11:09 pm
Thanks so much for your help!
I'm in the So. Bay Area in California, it's winter but it was a
beautifiul day today. I picked oranges.
The rose is poorly located in a corner of the yard next to a fence, and
gets hit with the sprinklers from the lawn. that must be the problem.
Generally it's in pretty good health, but has this leaf issue.
Thanks again,
LT
Snooze wrote:
> > Hi,
> >
> > I have a large Queen Elizabeth rose bush, it's probably 8' tall. Some
> > of the leaves are turning yellow. I have a picture of the underside of
> > these leaves here.
> >
> > What is this and how do I 'cure' it?
> >
> Looks like you have rust and black mildew. You didn't say if it's still
> winter wherever you are. If so, prune back the plant, cut away the branches
> that have the biggest problems, then spray with a dormant oil or fungicide.
> (Not on a warm sunny day) Certain roses are prone to fungus and mildew
> problems.
> Also how is this plant being watered? Drip irrigation? or an area sprayer?
> Try and reduce the amount of water that is sprayed onto the leaves, water
> early in the morning rather then in the evening, so the leaves have time to
> dry out.
> Fungus spores are transferred via water droplets, so the less water on the
> leaves, the better.
Posted by Snooze on February 15, 2006, 1:46 pm
> Thanks so much for your help!
> I'm in the So. Bay Area in California, it's winter but it was a
> beautifiul day today. I picked oranges.
> The rose is poorly located in a corner of the yard next to a fence, and
> gets hit with the sprinklers from the lawn. that must be the problem.
> Generally it's in pretty good health, but has this leaf issue.
> Thanks again,
> LT
Ah, I'm in SJ as well. This past week has been rather warm. See if you can
adjust the lawn sprinklers. Sprinklers tips, are designed for a spray
pattern and a distance. Maybe go for a shorter throw pattern. Sprinklers
also have a little screw on the top that can be used to adjust the throw
distance.
Try that, given the size of your rose bush, relocating it is probably not an
option.
-S
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> I have a large Queen Elizabeth rose bush, it's probably 8' tall. Some of
> the leaves are turning yellow. I have a picture of the underside of these
> leaves here.
> What is this and how do I 'cure' it?
> Thanks in advfance,
> Laura