topic Re: Help - Black Spot on Roses in Garden

Help - Black Spot on Roses

lovesallanimals — Sun, 06 May 2018 03:45:12 GMT

I am adding a lot of roses to my garden this year and my older ones look full with lots of green leaves - however - I just noticed today that the dreaded black spot is starting to appear on a few leaves. I have tried everything and nothing seems to work. I just spent over an hour on the internet looking at a zillion products with all sorts of warnings on them. I want something organic and I am at a loss as to what will work. Please help. I know that if I do not ****** this in the bud (no pun intended) all my roses will be stripped of their leaves.

Re: Help - Black Spot on Roses

rrpell — Sun, 06 May 2018 05:56:34 GMT

Bonide Copper Fungicide Spray or Dust RTU [Organic]
Active ingredient: basic copper sulfate

However, it may have to be done every couple of weeks.

Making sure all the leaves and affected canes are removed is important.

If that doesn't work, the Bayer products contain the chemical tebuconazole. It is not "organic" but formulated for the home gardener. It is effective in controlling black spot.

Bayer Advanced Garden Disease Control/Roses, Flowers & Shrubs Conc
Active ingredient: tebuconazole

The other option is hiring your local tree company to come over and spray your roses. I have done this. They have all options and will work with you to pick the best for your particular situation. They are licensed to use fungicides and are trained.

Good luck!

Re: Help - Black Spot on Roses

JustJazzmom — Mon, 07 May 2018 15:55:42 GMT

Try to use watering at the root zone with drip hoses/irrigation. Applying mulch around your roses helps keep fungal spores from splashing up onto them when there is overhead watering like rain or sprinklers.

Water early in the day vs. watering at evening or night hours. If using an underground sprinkler system set the clock to be @ 5, 6, or 7AM so leaves are dry by noontime. Watering @ 7, 8 or 9PM keeps leaves wet longer with the natural nightly dew happening & it set up a cycle for fungal diseases to take advantage of this watering schedule.

Choose more disease resistant roses — look on rose websites for words such as ‘excellent disease resistance’ vs. just ‘disease resistant’.

Miniature roses which are a special category of roses are by nature more likely to get fungal disease because they sit closer to the ground.

And black spot is different from anthractnose (another fungal disease) in that with anthractnose there is a black ring seen with a tan center. Blackspot is just that — an irregularly shaped black spot.

Re: Help - Black Spot on Roses

CJC — Sun, 06 May 2018 16:52:08 GMT

@rrpell wrote:
Bonide Copper Fungicide Spray or Dust RTU [Organic]
Active ingredient: basic copper sulfate

However, it may have to be done every couple of weeks.
Making sure all the leaves and affected canes are removed is important.

If that doesn't work, the Bayer products contain the chemical tebuconazole. It is not "organic" but formulated for the home gardener. It is effective in controlling black spot.

Bayer Advanced Garden Disease Control/Roses, Flowers & Shrubs Conc
Active ingredient: tebuconazole

The other option is hiring your local tree company to come over and spray your roses. I have done this. They have all options and will work with you to pick the best for your particular situation. They are licensed to use fungicides and are trained.

Good luck!

I have used Bayer Advanced for roses ever since planting my 3 rose bushes 6 weeks ago. 2 are fine for now, but the third (Rio Rose) has developed black spot disease in spite of my watering only in AM, avoiding wetting the leaves and using mulch. Perhaps it is just a poor type rose to plant down here in the humid South, but I bought it at our local Lowes. I am removing and discarding the affected lower leaves, but it's discouraging to pay big bucks for the Bayer product, then not have it perform as it should. I carefully followed all directions.

Re: Help - Black Spot on Roses

mousiegirl — Sun, 06 May 2018 17:01:02 GMT

@lovesallanimals wrote:
I am adding a lot of roses to my garden this year and my older ones look full with lots of green leaves - however - I just noticed today that the dreaded black spot is starting to appear on a few leaves. I have tried everything and nothing seems to work. I just spent over an hour on the internet looking at a zillion products with all sorts of warnings on them. I want something organic and I am at a loss as to what will work. Please help. I know that if I do not ****** this in the bud (no pun intended) all my roses will be stripped of their leaves.

@lovesallanimals I remove the affected leaves.

Re: Help - Black Spot on Roses

lovesallanimals — Mon, 07 May 2018 02:20:41 GMT

Thanks everyone! I have learned that no matter how much we care for our gardens, to a large degree we are at the mercy of the weather. You really can't do anything when you get several days of rain during the day and plently at night, and here on the East Coast it is really cold in the evenings, the worst thing for roses when the water sits on the plant. Oh well, I will just have to nurse them and hope for the best.

Re: Help - Black Spot on Roses

JustJazzmom — Mon, 07 May 2018 16:04:51 GMT

Bayer Advanced is not available in every state. What has worked for me is buying ‘excellent disease resistant’ roses. My roses might eventually get anthractnose, but it is around mid August that I see this, not now.

Unfortunately the big box stores at this time of year drag out the older cultivars to sell to consumers. Read good blogs like Houzz Garden Blogs as people in the industry as well as experienced consumers help people with their problems. Gardeners helping other gardeners is what I call it.

Re: Help - Black Spot on Roses

Dazlin — Sun, 13 May 2018 21:52:32 GMT

I diligently pick off all and any leaves that don't look healthy. Place in a bag and dispose. I give a quick check almost daily. I spray with Bayers once a week as a preventative. There are natural home remedies you can google...I haven't had to try those yet, ...I also use a systemic treatment from Bayers which should kill off some diseases as well as fertilize. Yes, the weather sure plays a big role too. I try to adjust the care accordingly. I'm always here asking questions, and searching online. I'm learning as I go too. But basically, I find that if I pick off those infected leaves, and spray...it goes away. I would also say, Rose's need ALOT of attention. I knew what I was getting into 😏