Roses forum→Rose leaf discolouration

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Lancashire
RuthieB
May 30, 2020 12:17 PM CST
Help!
My roses leaves have started to turn brown (not sure if black spot) and the new shoots are very shrivelled. It has had two doses of rose clear (don't want to do another yet) and I've been using soapy water on the new shoots. There's only the odd aphid on the newer shoots which won't have had rose clear on. I tend to just squish them.


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[Last edited by RuthieB - May 30, 2020 12:21 PM (+)]
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Coastal Southern California (Zone 13a)
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jerijen
May 30, 2020 2:44 PM CST
Ruthie -- What has your weather been like?

I guess that could be blackspot ... what do others think? To me, it looks more like downy mildew. Have your conditions been very wet?
Name: seil
St Clair Shores, MI (Zone 6a)
Roses Garden Photography Region: Michigan
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seilMI
May 30, 2020 4:12 PM CST
No it doesn't look like black spot to me. I'm wondering if it isn't spray burn? If it's been hot and sunny anything sprayed on the leaves could cause burn. Even soapy water.
Lancashire
RuthieB
May 30, 2020 4:21 PM CST
Ah okay. Will they recover? We have had quite warm weather (for the uk!). I only planted it about a month ago so have been making sure it is well watered (not in the heat) but I maybe have sprayed soapy water in bright sunlight. Am I watering too much do you think? My dad said to make sure it gets plenty of water as they are thirsty.
Name: seil
St Clair Shores, MI (Zone 6a)
Roses Garden Photography Region: Michigan
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seilMI
May 30, 2020 4:33 PM CST
No, if the rose has adequate drainage you can't really over water it. Roses love a lot of water but do not like to have their roots sitting in a pool of water. Did you do a drainage test for your planting hole?
If it is unusually hot extra water may be necessary. Do stop the soapy water. Aphids are not really that big of a problem. The soap may be doing more harm than the aphids. The existing leaves will not get better but the rose will grow new ones to replace the damaged leaves in a few weeks.
Lancashire
RuthieB
May 30, 2020 4:57 PM CST
Thank you
Coastal Southern California (Zone 13a)
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jerijen
May 30, 2020 5:03 PM CST
Come to think of it -- might the soapy water have caused the damage?
PNW (Zone 8b)
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Aerith
May 30, 2020 7:14 PM CST
One of my rooted cutting from the neighbor has similar problem. I spray nothing so I think it is some kind of fungus disease. It emerges after raining and those tiny spots expand to turn the leaves completely black. I just pull them off. I'd guess it's downy mildew or a weird BS.
Lancashire
RuthieB
May 31, 2020 4:33 AM CST
Should I remove the affected leaves?
Name: Porkpal
Richmond, TX
Charter ATP Member Dog Lover Cat Lover Keeper of Poultry Keeps Horses I was one of the first 300 contributors to the plant database!
Garden Ideas: Level 2 Plant Identifier Raises cows Roses Farmer Celebrating Gardening: 2015
porkpal
May 31, 2020 7:40 AM CST
I wouldn't. As long as they are green, they are helping to nourish the plant.
Porkpal
Name: David Tillyer
New York City (Zone 7b)
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BigAppleRoseGuy
May 31, 2020 8:58 AM CST
Since it seems to be on your front door step, you might want to snip the shriveled up bit in Picture #2.
Otherwise, Porkpal is right, the leaves are still doing their job.
Lancashire
RuthieB
Jun 4, 2020 11:51 AM CST
Should I remove the affected leaves?
Lancashire
RuthieB
Jun 4, 2020 11:51 AM CST
Thank you
Lancashire
RuthieB
Jun 4, 2020 11:51 AM CST
Ah okay. Will they recover? We have had quite warm weather (for the uk!). I only planted it about a month ago so have been making sure it is well watered (not in the heat) but I maybe have sprayed soapy water in bright sunlight. Am I watering too much do you think? My dad said to make sure it gets plenty of water as they are thirsty.
Name: David Tillyer
New York City (Zone 7b)
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BigAppleRoseGuy
Jun 4, 2020 12:59 PM CST
Looking at your weather in Lanacshire, it's about13-14 degrees C or about 55 degrees F. It also seems to be nice and humid (78%), so I don't think you need to water abundantly. When you do water, water the roots, don't shower the plant. And, yes, clip off the ugly bits.
David

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