Please help diagnose this Rose's affliction

8 years ago

Hello,

There are lots of reddish brown to black spots on my climbing rose.. it seems to me worse at the base of the plant but I can see some at the middle part of the plant as well. Now I have a geranium Orion climbing on it. Not sure if that is causing the problem. I have also seen small webbing on one of the leaves but an insect, does not look like aphids to me though it looked the same size as aphids but this one moves quite fast. Please see pics. I have watered it, thinking it might be spider mites but I didn't see any..please let me know what you think this might be. Thank you.

Featured Answer

Eli Harvey

8 years ago

those black spots are probably blackspot - a fungal infection. I see a lot of water on the leaves - is that how you're watering it? Fungus thrives in moist environments, and watering the foliage can make it more susceptible, especially if its not able to dry out completely and quickly. This is one of the reasons the lower sections of a plant tend to get it worse - the leaves are shaded from sun and don't get as much air circulation. I would make sure to only water the base of the plant from now on, and you'll probably need to treat the existing infection with a fungicide to prevent recurrence. I know a lot of people have their own remedies and organic or chemical free treatments, but if you're not against using chemicals I suggest Bayer Advanced Disease Control for Roses, Flowers, and Shrubs or somethign else containing Tebuconazole.

Sort by:Oldest

Comments (8)

patty57
8 years ago
Mark, There are two very good rose forums here: Antique Rose and Roses. You may get some answers over there.

Do a search on both possibly first as the subjects are quite broad and you may find your answer within a search.

Do a google search on black spot, insect damage on rose leaves, etc and check out the images too. You will probably match yours up to one of them and you can read all about it.

patty
Related Professionals
Rome Landscape Architects & Landscape Designers · Rock Hill Landscape Architects & Landscape Designers · Poughkeepsie Landscape Architects & Landscape Designers · Rutland Landscape Architects & Landscape Designers · Greenville Landscape Contractors · Huntington Landscape Contractors · Aurora Home Builders · Ithaca Home Builders · Kahului Home Builders · Cherry Hill Landscape Contractors · Spartanburg Home Builders · Houston Home Builders · Stamford Home Builders · Platteville Home Builders · Eureka Home Builders
Jorge
8 years ago
It’s blackspot. Use what Eli said, the Bayer Advanced Disease Control for Roses. I live in South Florida where it’s always humid and it controls it here excellently
ken_adrian Adrian MI cold Z5
8 years ago
when i had 100 roses ... i bought a water wand.. and watered the soil ... rather than the leaves ...

https://duckduckgo.com/?q=water+wand&t=ffcm&iax=images&ia=images

also try to avoid watering in the evening .. making the leaves wet.. all night long ..

also ... increase air movement around the plants .. if you can ..

also.. find resistant varieties ...

when i had that collection.. i had a monthly spray regimen for bugs and disease ... and that is one of the reasons that collection went by the wayside ...

ken
jim1961 Central Pennsylvania Zone 6a
8 years ago
Dark spots do look like blackspot disease...
Mark zone 8, Vancouver BC
Original Author
8 years ago
Thanks everyone for your reply. I find a much quicker reply over here and I appreciate that now I know what I am dealing with. Thanks again for your suggestion. I will look into getting antifungal for this rose.
rifis (zone 6b-7a NJ)
8 years ago
last modified: 8 years ago
Mark, the OP, indicated he thought he had a spider mite problem, and, thus, he "watered it" (the leaves). I wonder if the 2 posters above realize this ( despite Mark clearly stating why the leaves are wet). I see this discussion also appears in "perennials".
ken_adrian Adrian MI cold Z5
8 years ago
I have watered it, thinking it might be spider mites but I didn't see any

==>>> blasting mites off a plant.. is more of a blasting.. rather than a watering .... semantics i presume.. but i take words at face value ... but maybe you are right...

regardless.. i dont think it mites ... black spots on roses are black spot ... a fungal disease ... easy peasy ....

and ... i mentioned increasing air flow... letting a geranium grow on it.. reduces air flow.. potentially increasing the fungal issue ... or i should say.. creating an environment where the fungus might increase ...

ken