Dark Spots on Rose Stems
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- เผยแพร่เมื่อ 13 ก.พ. 2021
- Dark colored spots on the stems of roses can be unsightly, but are they damaging? And should you prune them off? The answer should depend on the overall condition and health of your roses, and I suppose also on your own tolerance their appearance. The likely candidates are black spot & botrytis (both are common enough) but it also could be a number of other fungal diseases. The spots may appear red, purple, brown, or almost black - and can remain as small speckles or enlarge to blotches.
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Thanks Jason. I have planted a few roses over the years without much luck. Last summer I decided to try again and planted about 15 roses and found your channel. So I'm sure with your help I will be more successful this year.
Really interesting video I've learned a lot over the last year. I'm 71 and started gardening when I retired I'm trying lots of things with a lot of roses throughout my garden. Thanks for all your help. Dave from Liverpool England.
Thanks Dave
Well said Jason, a very good lesson for most wooded and shrub type plants, not just roses. Careful observation will usually lead to discovering what the likely cause is without drastic actions being taken. However, sometimes serious measures are necessary, but the evidence is usually quite obvious. Like you indicated, most of these issues are climate related and once those conditions are remedied the situation typically corrects itself. Transition weather is the most common trouble maker, changing from fall to winter and then from winter to spring are notoriously wet periods contributing to many of these issues. Outside plants weather just fine and outside potted plants can be moved to dryer areas to reduce moisture issues.
I have actually loosely tented a few plants that seemed to struggle with the extra moisture on them. The root systems were fine, but for some reason they were vulnerable to the extra wetness standing on the stems. The tenting kept the stems dry while allowing the root system to enjoy the moisture. Of course that only works if you have just a few plants.
Common sense prevails! Thank you Jason. 👍
Thanks Bryan
Yes. The non alarmist approach, is the way to go. I like the way you keep all answers valid, yet making your thoughts and science, well known. Thanks Jason. Juli in Tucson 🌵🌵
Thanks Juli. I appreciate the feedback
Jason, thank you so much for this information. You've just saved me so many mistakes! I was relieved to know that the rose immune system will usually contain the canker until it becomes inactive. And that I should prune if the canker has girldled half the circumference of the stem.
Happy Valentine's day, thank the roses!!!!
Thanks Jason!!!!!! Last year I did freak out on a different problem, responded by cutting what I thought was a damaged cane, only to find that the damage was the newly minted and evil Japanese Beetle - nothing that cutting will do anything about that's for sure.
Now, my 2nd year into growing roses while really studying, I'm listening and learning instead of reflexively cutting.
My Favorite subject😀! Roses 🌹🌹🌹!! Perfect theme for San Valentine's day 💖💖💖!! Thank you Fraser Valley Rose Farms ! I love the foggy background in this video. I love cold weather! It is 18 degrees here in central Texas where I live. Tomorrow we will get down to an unusual 10 degree cold front ❄🥶 💙
Thanks. That was all a fine snow falling on Nicomen Peak - and we got some down lower elevations a couple of hours later. But nothing like 10F! Ouch.
Oklahoma... (laughs in -10)
One of my new roses only has one cane that has these spots. I'm glad I haven't thrown it out. It's starting to bud now with warmer weather so hopefully it recovers!
Very good video. Cut only as much as you feel you really have to. Like my bush, it just kept going down, looked really bad, so I cut. There are some other thin branches with spots that I left. Could be fungal, but there's also treatment, so I spray it.
Helpful as always, thank you!
Thank you for making this video and for your recommendations. I’m in the group of a newly establishing own root rose. Just got to make it strong and give it time.
Thanks for information given in this video appreciate your explanations on this relevant subject, I now know what to look out for 👍
Wonderful post! I have been wondering of my rose branches brown patches. Thank you alot!
My pleasure!
You gave me peace of mind? Thank you.
Great information! My natural inclination would be to cut the stem 😏
Thank you! Awesome video as always! 👋
Hello from Whidbey Island! I love, love, love roses and combine them with my passion for clematis. I gave up on hybrid teas years ago, and now only grow old roses, David Austen, floribundas, etc. They still get blackspot and other maladies, but the more you support the rose with water and lots of mulch and compost, they do well and can keep the nasties at bay!
Thanks Gina. Good to hear that your kindness (to the roses) is being rewarded with good results
@@FraserValleyRoseFarm I would love to visit your farm, sometime when we all ‘get sprung’ and things get back to normal. I’m so happy to have my garden!
Hi Jason and good morning. I came across your video and honestly I’m not sure when you film this but I am watching it on April 23, 2024. So yesterday I uncovered my roses and took away all of the dry leaves that I had them covered with over the winter, and I was starting to prune and check out the plants. I noticed that I already had some black spot on some of my leaves and I might note here that last went last summer. My roses were suffering quite a bit from black spot where they actually lost most of their foliage, and it was very upsetting of course. When I winterized all of my plants yesterday, I noticed a lot of dark spots reddish purpleish spots on many can of my rose plants and I went pruning crazy! I will attach a picture here of what I did and I am hoping that my roses will be OK. Most of my bushes have been in the ground for a couple years so they are definitely well established, but when I found all that dark spot and blistering, I cut most of the stems down pretty low. I am hoping and praying that my rosebushes will survive my pruningenthusiasm, and if you can give me some words of confidence that would be super fantastic!
Sorry, just catching up with comments now - but yes, I can be encouraging in this situation: otherwise healthy roses will often bounce back nicely from even a low prune at this time of year.
Hi Jason, I have a question. What about copper fungicides? Would that help the infected rose? Also, could that be a good way to prevent spread to other roses? Thanks
Thank you so much for this incredibly informative video! I had learned a lot of this about canker and risks/benefits of cutting from both research and experience (oops killed that one rose😮)…. But I hadn’t figured out what the tiny red speckles were on my canes. Thanks for confirming my suspicion and guidance for approaching it. Take care 😊
I have an extremely old rosebush probably 25 years old I have cut it back to the ground several times and I’ve also cut out the old wood of the rose that was Dying, but I can never get away from black spot and it is such a Lovely rose and fragrance,one time I even used A chemical called Bayer which I’m not proud of but I haven’t done it again I’m working on taking all the lease off but if you have any other ideas that are organic I would love to hear them.I also love that you don’t overreact about a disease thank you so much
Hi Patricia - some varieties just seem far more susceptible than others, and then it just becomes a matter of "what can you live with?". I put up with blackspot for a number of my old roses because they're worth the extra effort, but if it were just a knockout-style landscape shrub, I'd dig them out.
@@FraserValleyRoseFarm Thank you so much for the reply so quickly I appreciate you answering me
@@FraserValleyRoseFarm I bet this rose is from the 1950s early 60s so it’s not one of those shitty knockouts it’s like one of those amazing fragrant old fashion roses, you know the roses that are in all Catholic school neighborhoods😊, symbol symbol of the roses that the Blessed mother heard your prayer!
This was so useful thank you so much for this info
Dear Jason. Thank you and I love your videos and information I learnt a lot. Is there any way to give some information how to replant old rose bush. I appreciate your guidance
You bet Renuka: th-cam.com/video/AVNR8oK0OWE/w-d-xo.html
Thanks for the info, always!👍🏽👏🏾🙏
Great video. Thank you.
Hi, Thanks for the videos. It was interesting to see at 4m17s a picture of something we found on our roses last season. That scar down the rose stem is caused by rose saw fly. They come along and lay their eggs in there and the damage can be devastating. When the young hatch, they wander on up the branches and eat the leaves away to nothing.
I've been gardening for years but we moved to a brand new house 3 years ago and have started the garden from scratch so many of our plants aren't yet established and the soil is horrendously poor still. On top of that we've had two very hot, dry summers which are very stressful for young plants.
All we could do with the sawfly damage was cut it out and hope for the best. All our roses have recovered thank goodness. I just wanted to share this so other readers could identify it and act quickly if they see it in their gardens.
It would be great if you would cover the different types of pruning required by different types of roses. I know all about shrub roses but now we have two climbers and one rambler. I'm used to cutting everything down by a third in Autumn and the remainder by half in spring but that's no way to train a rose up a wall! What do I do?
Thanks
Thanks for sharing your experience Emma. I'm sure others will find it helpful. I have done a video on climbing roses: th-cam.com/video/5EZirmc4h3I/w-d-xo.html and I'll be sure and share more specific pruning videos for other styles.
Hey, I've got quite a few brown spots myself & by golly, NOBODY better suggest pruning me!
Amen
Thank you, from a beginner gardener from South Africa. My newly establishing roses have black spot on all of the thicker older canes including the main stem. They’re young so they only have about 4 stems each. I was panicking. But they don’t seem to be struggling; they are continually sprouting new foliage, branches and buds. I have treated them with fungicide. so I’ll leave them be :)
Good call! I'm glad you didn't strip them any further looking for clean wood - that can definitely go too far.
Always helpful
This is why I come to these videos. He isn’t saying right away get rid of it! He thinks logical and tells you don’t worry it could be just this. Thank you as always Jason.
Thank you for the good lessons
Thanks so much for your videos...always helpful! I use organic neem oil spray and wonder when I should start spraying to take care of any remnant issues from last season or that may be overwintering on the roses? Maybe, could you do a video on that? Thanks again
Thanks Pam. You can start neem early (but after the risk of a deep frost) and keep applying every few weeks as needed until the temps is too high (around 80F/26C)
Thank you so informative!
Back to watching this video 😢 on the pink double knockout rose
Thank you!
I wish I watched this video a long time ago. I cut back my rose in a panic and it is not the same as it was before.
I watched this video after watching and commenting on the Black Spot Video.
Thank you for this follow up.
My concern is the “black spot” on the rose I rooted is on the main stem. If I take the safer suggestions from the Black Spot Video and apply something like copper spray to the plant will it keep the issue from destroying the whole plant? Or, since this is a new rooting, am I starting with a fragile plant that might continue to suffer problems?
The discoloration doesn't really go away, so it's hard to say that if you used copper or sulfur or some other fungicidal treatment, whether that will render the spot "inactive". In my case it's more a matter of "pick your battles" - I couldn't possibly remove all of the spotty canes from my garden, and it may do more harm than good to try.
Thanks!
I'm very conflicted because I've had botrytis and rose rosette. I regret that I didn't deal with it early on. On the other hand most are fine. I feel that a good spray of copper is worthwhile to prevent anything from developing.
You got the right idea. I dont usually use the liquid copper I use Daconil. This time I am going to especially use the liquid copper on all the mulch in my bed. Last year I used the liquid copper on my Bush daisies and they were good for the whole year. The other thing we added to the liquid copper was miracle grow. Especially for shrubs the fertilizer helps the plant uptake the fungicide. 🍃🥀🍃
I do use a copper based mix (Bordeaux mix) as a dormant spray, which helps to reduce overwintering spores for blackspot, I think. Botrytis is pretty much everywhere, so I'm not sure you can do much to prevent it. Copper wouldn't do anything for the rose rosette virus.
Jason - this will be my 3rd season for a pink climber (so far, no blooms ever) and I removed a lot of leaves the first year due to black spot. Last year, we had a brutally hot summer and although it suffered, the rose survived. This spring, I noticed that 2 canes are spotted and a 3rd cane growing up right in the center is beautiful, green, and perfect looking. The spotted canes are getting new growth on the ends, but should I prune them or keep them?
A little hard to make the call just based on a description, but as mentioned in the video, a little bit of spotting isn't the end of the world, so I'd make the call moreso on the size/shape of the climber and where you want the canes to be located. If they serve your purposes for now, leave them on. Your overall goal over time is to continue to prune & thin over the years, so they won't be on there forever.
My rose bushes keep dying I have to keep moving them. I live on a high rise so I can only grow on planters on my patio. I do live in the desert that’s why I have to keep moving them around because we face west and we all know facing west in the desert is always full sun afternoon
That's a different challenge than we have around here (usually it's excess moisture causing our problems). One trick I've seen used in warmer climates (and you might already be doing this) is to use an inner pot and an outer pot - with a little air space in between. Preferably with a lighter colored pot on the outside. I guess the idea is that the sun may warm up the container and stress the plant, but the outer pot serves to shade the inner one and protect it from the excess heat.
Hi Jason, My Sweet Mademoiselle Rose, who’ll will be 3rd year old in my garden next month has black spots all over the canes I am noticing now. It is a vigorous rose which has grown to almost 6 ft. in summer . I pruned her down to about 4 and half feet. But now I am noticing these black spots all over her canes? She is planted in full sun and I fertilized once a month from April to September with Jobe’s organic fertilizer for Rose & Flowers. Please advise what I should do with this rose.
As mentioned in the video, I'm not inclined to chase down every mark or spot on the stems - beyond just good conditions and judicious pruning, I'm not sure what else to recommend.
Some canker pathogen has very quickly overtaken two of my floribundas- one of which I drastically cut back- I will leave the second in case it can heal itself…
Thanks for the info! When would be a good time to cut it back down and how far down?
I prune in late winter / early spring. How low you cut depends on the plant and your own preferences. I do have some examples in my other pruning videos.
@@FraserValleyRoseFarm Jason, thanks again for the great content and info :)
I have black spots on the base of acouple of my stems would adding a fertilizer to the base of the rose help
Not directly. A healthy rose may overall resist better, but it's not curative.
i have a begonia but i do feel inclined to not trim when it seems as tho i am in an initial stage of infection. would you suggest changing the soil ? my brown spots are tiny compared to the stem
I'd keep an eye on it and see how the symptoms develop, and hold off pruning or changing soil (which can be stressful too) until you conclude it's a more serious problem.
hi Jason, this disease of roses, which we are used to define in the russian rose-growing community as mildew or peronospora (a group of plant diseases caused by pseudo-fungi from the class of oomycetes, mainly from the family Peronosporaceae), which is also found on grapes, infection of the shoot occurs from the top and goes down burgundy spots - this inhibits flowering and the whole plant. We cut out such shoots and carry out treatment with pesticides against mildew. We pour it under the root and spray the plant several times per season. Sorry for the imperfect English)
Thank you for your perspective on this. Always good to learn from other peoples experience
Are these all roses behind you??? Amazing, from the other end of the country
Hi Marcel - I'm at the edge of the property, and those are blueberry fields behind me. It was just the spot where I could be out from the cold wind!
I was told that first year roses focus on roots and not to be alarmed that a bunch of my first year roses had to be trimmed back to almost nothing due to steam death. Is that true?
It's true insofar as worrying (or being alarmed) is never much help. Young roses are definitely more vulnerable to stem die-back than larger, more mature shrubs. Generally I do try to offer some protection for very small roses in their first winter unless they're super hardy to my climate.
My 5 roses had Black spot on the leaves last fall. Now no new signs of growth except for new sprouting from below the union.?
Sorry to hear it Betty! I'm not sure I'd conclude that blackspot caused the stems to die because it's generally a severe health threat (like, say, cold weather in some climates).
Hi Jason, is it safe to water the rose with light fungicide solution to not only fight the fungi on the ground or the rose base but also when the humidity hits, the water that evaporates brings up the fungicide to fight the fungi on the plant? Thank you
You really can't say anything general about fungicides - each one is chemically quite distinct, with its own application method and mode of action. It's possible that some can be usefully applied to the soil, while other would just be wasted (or even harmful). When you decide to use pesticides, you really have some studying to do.
@@FraserValleyRoseFarm I only use Potassium Bicarbonate. Would it be considered safe?
Yes, it's fairly harmless. I wouldn't count on it having much residual effect on the ground, though.
I'm a little late to this party but thanks for this video, Jason. Is there a way I can upload a photo or email you one to get your opinion about how to deal with a black spot on the cane of an Alnwick Rose I have? I have been fighting black spot since last summer, pulling off lots of leaves. Today I noticed a few canes near the top were black so I cut them off along with some buds that were about to bloom. Then I noticed a big black spot on one of the biggest canes at the center of the plant. It has been one of my biggest rose bushes and looks healthy in spite of all the problems so I'm really not sure what to do about this. If I prune the spot off, I will be cutting down one of the biggest canes. I don't know if it's typical of Alnwick roses but the shrub is pretty compact and upright with lots of canes close to each other. I'm trying to leave air circulating inside the plant but the canes are close to each other. Plus, I noticed that a lot of the infection seems to be at the "back" of the plant, meaning on the side that faces away from the sun. The sunny side is more or less okay but the shady side now is pretty sparse since I pulled a lot of leaves off and trimmed off those black tips.
Any help would be appreciated. 🙏
No, there's no real way to insert photos here in the TH-cam comments and I don't have a lot of time for any other correspondences. This video says pretty much all I can offer on the topic anyway. It's a tough judgement call how much to remove of spotted canes, but I'm leaning to the side of leave the stems in place if complete removal would be too radical.
@@FraserValleyRoseFarm Thank you so much, Jason. I know you must be very busy so I appreciate just a response here. I was leaning the same way. I will keep my eye on it and if it seems to be getting worse I can always remove it then.
Thanks!!
My pleasure
Hi Jason, nice video! What made you like roses as a hobby and business?
I was inspired by a few good books to add to my rose collection - then I noticed that several Canadian suppliers of roses were closing down or reducing their assortments. Sucky timing, coming into the hobby as it was declining. I had trouble finding many of the roses I was looking for. With that in mind, it seemed a natural fit to propagate the roses I added to my collection and make them available to other gardeners.
@@FraserValleyRoseFarm Thank you, you're a natural green thumb! Have a nice day!
My 10 yr old new dawn climbing rose suddenly has dark black (some are even soft and oozing) spots on the newly sprouting canes. They are not cane borers, I cut one to check. All the new spring growth and buds form the older canes have it but the older canes so far look fine. I can’t figure out what it is and I don’t want to chance something incurable spreading to my other new dawn rose which is only 3 yrs old. Any feedback would be greatly appreciated. Thank you
Soft and oozing sounds bacterial. I'd cut well back from the affected tissues.
@@FraserValleyRoseFarm I previously cut back the 2 new canes that were effected but 2 new ones that just popped out look the same. Do you know what it’s called and if it’s treatable or if all the new shoots are going to continue growing with this? Sorry for all the questions :/
What about black spots on dormant bare root roses? Are they still healthy, or should I contact the seller?
They'll be fine. A vigorous rose will grow through a few little spots.
One cant treat this with a copper/sulfer spray or something similiar ?
The markings themselves won't be erased by any treatment. A dormant spray during winter is not a bad idea, as it may help to reduce the risk of any remaining spores reinfecting new tissue in spring.
Hi Jason, it's June 18, 2023 so I don't know if you'll even read this now, (two years after this video), but I have a question. We have a well-established rose bush that has grown up against the house outside a kitchen window and is about 10 feet tall. It was here when we bought the house four years ago and has bloomed every year until now. The canes are mottled with dark spots or dead. There are no leaves. We had a hurricane last September that did a lot of damage and I'm wondering if that caused this problem. A couple of months ago I pruned the dead branches. Some of the canes are still green but with spots. I left those. But by this time of year there should be some sign of life and there is none, except at the very bottom of the plant where new growth has started, now about one foot tall. Should I cut back the leafless canes to the bottom of the bush? It looks sad with a foot of new, leafy growth coming up from the bottom and 10 feet of leafless canes above. Thanks in advance for your advice.
Yes, I'd probably cut right back down to the new growth at the base
@Fraser Valley Rose Farm Thanks for the reply! I'll do that today.
Hello Jason, I have a rose has strong new shots, but the leaves on the new cans suddenly dry out ( have enough water) I notice the new cans has brown spots. I did know what to do and what it is so I cut them off. What it could be ?
I wish I could be more helpful, but I've learned that trying to diagnose a health problem from (a description of) visual symptoms will often likely lead to the wrong conclusions. Dark spots on the cane as shown in the video aren't usually all that serious, but a quick wilt of new foliage is more concerning. If you can't pinpoint the stress, damage or pathogen and it doesn't bounce back into healthy growth straight away it might make sense to dig it up and get a look at the roots for signs of damage or rot.
@Fraser Valley Rose Farm thank you. Then do you know what will cost a long, strong new shot, the leaves on it all dry out ? Very strange
I would definatly treat the plant and the ground around it with fungicide. Remember to treat again 2 weeks later. I'm about to do the same with mine. It's just a thing we do at the beginning of Spring to get them a good start. Good Luck !!
Me too!
Thanks Dianne. I don't fuss with fungicides for my own reasons - and manage to keep the diseases at a low level for most (but not all) of the season. What's available to gardeners for fungicides does vary by jurisdiction, but what have you found effective?
Will dormant oil help keep black spot under control?
Yes. Winter applications of dormant oil, lime-sulphur and or bordeaux mix can help to cut down on the overwintering spores
Thanks so much. You just saved my Hot Chocolate and Ice cream Rose bushes
You know so much about plants. Did you study horticulture ?
Thanks Giancarlo. Yes, I went to horticulture school at Kwantlen Polytechnic University.
English captions.....Korean right now.
Yeah, that's the first time I've seen TH-cam auto-caption one of my videos in a language other than English. Puzzling!
@@FraserValleyRoseFarm I really was surprised to see Korean. I am deaf and really like your teachings on roses and lavender. Do you sell roses?