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Organic Gardening: Milk and cornmeal sprays for blackspot

Communities > Forums > Organic Gardening
Forum: Organic GardeningReplies: 7, Views: 84
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Howell, MI

July 5, 2010
12:31 PM

Post #7945237

Has anyone used either milk or cornmeal/water spray successfully for blackspot on roses?
Elmira, NY
(Zone 6a)

July 13, 2010
7:06 AM

Post #7964686

No, but I have used sulfur dust. It worked pretty good.
Fairfield County, CT
(Zone 6b)

July 14, 2010
11:19 AM

Post #7968075

I've tried cornmeal sprinkled around the roses and had some luck with that. I used a copper spray on the neighbors roses and I think that it helped. Not sure as I was gone for a week - but I noticed that they looked much better when I was pruning them yesterday.
Morrisville, PA
(Zone 6b)

August 15, 2010
3:15 PM

Post #8041796

I have had great success in doing the following:

1 week spray with the following mixture: 1/2 tablespoon of apple cider vinegar, 1/2 tablespoon of pinesol and 1 quart of water.

following week spray with the following mixture: 1/2 tablespoon of baking soda, /2 tablespoon of pinesol and 1 quart of water.

I have been neglectful and did not maintain weekly spraying ... hoping the problem was gone for the season ...WRONG, WRONG, WRONG

Yesterday I noticed a black spot on a rose leaf. I apologized to the bush and later sprayed with the apple cider vinegar mixture. Next week I will use the baking soda mixture.

I do not know why but you should alternate the mixtures you use for spraying.
Deep South Coastal, TX
(Zone 10a)

August 17, 2010
9:06 PM

Post #8046595

Neem oil is the best thing for black spot on roses but you have to start spraying early and maintain a regular spray schedule.
Deep South Coastal, TX
(Zone 10a)

August 17, 2010
9:08 PM

Post #8046600

Just remembered one more remedy that works (sorry, I no longer grow roses, no time). Take leaves from tomato plants, about a cup full. Mix with one quart water in a blender, blend until really chopped up like slush. Strain to remove pulp, spray once a week. Same as neem, start early and maintain a regular schedule.
Fairfield County, CT
(Zone 6b)

August 18, 2010
5:45 AM

Post #8047028

I'm having really good luck this year with a copper soap. I started spraying BEFORE I saw any mildew or black spot and continue every two weeks.
Deep South Coastal, TX
(Zone 10a)

August 18, 2010
8:46 AM

Post #8047347

I like copper soap, it works well on PM and doesn't burn the leaves of tender plants.

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