Treating Black Spots on Rose Bushes

May 18, 2005

If you have rose bushes, fungal diseases such as black spot and mildew can be prevented, but not cured. Spray a fungicide every 7 to 10 days as a preventative measure.


By Terri H.

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May 23, 2011

I have noticed black spot on some of my roses. What do you suggest?

By maeref


May 31, 20110 found this helpful
Best Answer

Try 1 cup of cornmeal to 1 quart of water. Set for one hour and spray roses.

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June 9, 20110 found this helpful
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In rose care the best thing is a systemic feed that also has properties against black spot. After care, the best thing is a commercially produced and carefully applied fungicide labelled specifically for black spot.

Once you get rid of the black spot, be careful to avoid reintroducing conditions favourable to its development-don't water close to or after dark; keep the center of the plant open with proper pruning; space new bushes proper distances apart; and disinfect your pruning tools between cuts, not just plants.

Feed with one of the systemics to keep a beautiful and healthy plant.

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May 20, 2011

What can be done about roses that have extreme black leaf?

By Paula H.


May 20, 20111 found this helpful

In the old days, they would tell you " throw your dirty dish water on it". Now a days very few people wash dishes by hand. So put a little dish soap in your watering can, suds it up and pour it over your rose bush. I would remove the bad leafs. I have alot of rose bushes and it works for me. Do not use eletric dishwashing detegent!

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May 31, 20110 found this helpful

I was having problems growing roses, so I went to a class. the most important thing I learned was to make sure I never water the leaves. Since I started only hand watering the rose bushes from the bottom, they are doing great! I also keep lots of composted soil around them, covered with mulch and then I do not even need to fertilize them at all.

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June 11, 2012

Where can I buy on line Captan for black spot on my rambler rose?
Please and thank you.

By Alice

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June 4, 2012

I have black spot on my ramble rose and all the leaves are slowly dropping. Is soapy water any good if I spray it with that or do I have to get Captan to clear it?

By Alice

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