I have several rugosa roses that got a fungus this summer--I sprayed repeatedly but never got it handled. I have been told to spay the canes with a lime sulfur spray in late winter.The rose hips have turned red & look pretty, but should I cut the bushes to the ground this fall? Should I leave them alone until it is time to spray? Please tell me!
2006-10-17 05:56:39 · 4 answers · asked by dbrcymry 3 in Home & Garden ➔ Garden & Landscape
I agree with Adina.
Rosa rugosa isn't prone to the same extensive list of ailments that hybrid (show) roses are. I think you might have some sort of hybrid shrub rose, which has parents that make it susceptible to blackspot or other fungal diseases (the Meidiland roses and Flower Carpet roses can both get those diseases, I know that some Meidiland varieties will 'hip' as well.).
I think you might want to take a sample of the rose, or tags to your local independent garden center and ask them for advice. I would not cut it to the ground, unless it is some sort of last resort.
That would almost assuredly kill the shrub, if it were a hybrid sort.
Lastly, and again I agree with Adina, Rugosa roses are usually damaged by chemical sprays. I wonder if the "damage" that you are prescribing to a fungal problem, might actually be the chemical burn.
I hope that this helps
Good luck-
2006-10-17 07:27:38 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Wow...my rugosas have never had a fungus before. I thought they were nearly indistructible. Thanks for asking this question, as I would not have known it could happen.
Knowing what I do about Rugosas (I have 'Hansa' in my landscape). They don't like to be sprayed with anything. My advice, would be to wait until spring to prune. I always prune out the oldest canes every spring so that only one year old growth and current growth are present. This also keeps the middle of the rose more open so that air can circulate better. Remove any mulch around the plant and trash it. Replace with new mulch. There are also some people on some gardening boards that I frequent who have good luck sprinkling cornmeal on top of the mulch under their roses during the growing season to help prevent fungus and black spot.
2006-10-17 06:08:20 · answer #2 · answered by Adina 2 · 1⤊ 0⤋
Cut back ASAP and put in a landfill (burning will redistribute spores). It sounds like powdery mildew, you must use a preventitive fungicide, not a curative.
2006-10-17 06:06:09 · answer #3 · answered by Ralph 5 · 0⤊ 0⤋
yes
2006-10-17 10:14:01 · answer #4 · answered by Paige J 2 · 0⤊ 0⤋