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Is this Black Spot Disease?
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Posted by equinecpa 7 (My Page) on Mon, Nov 9, 09 at 10:40
| I have a couple of roses that I was pretty sure had black spot disease earlier this year. I pruned them hard and treated with oatmeal tea. It seemed to help but after all this fall rain it is back with a vengeance.
Now I noticed my plum tree that is in the same area has spots all over its leaves, My blackberry bush also seemed to have the same trouble this year. Does black spot disease affect other plants like fruit trees and berry bushes?
What is the best fall treatment for this? |
Follow-Up Postings:
RE: Is this Black Spot Disease?
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| I don't know about your plums/berry bushes, but yes, I've had a lot of trouble with blackspot this fall, too. I tried some of the anti-fungal spray that worked well last spring, but the blackspot seems more persistent this fall. You must follow a treatment regimen to control it. I wish it would just go ahead and freeze and we'd be done with it. |
RE: Is this Black Spot Disease?
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| I know all about black spot on roses. You need ground cornmeal, from the grocery store, put it around each bush, dig it into the soil. You need to spray the roses with 1/2 water and 1/2 2% milk, and do this every week for about 3 to 4 weeks. I aso remove all the diseased leaves from the plant.(destroy the leaves) do not drop on the ground. If you follow this, your rose will do fine. I also put 7 pennies around each bush for copper, they love it, as well as coffee grounds, and banana peals. Barbra, |
RE: Is this Black Spot Disease?
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| It seems that 'blackspot' is just one kind of quite a few fungal diseases that affect leaves. Leaves of many plants this time of year are old, tired and stressed from a long hot summer and thus more vunerable. The moisture in the air from recent rains are allowing fungus spores to get a foothold. I don't worry too much about it since, as mentioned above, coming frosts will cause the leaves to drop soon anyway. Applying cornmeal, as suggested, might be a good practice to kill the fungus on the leaves that fall on the ground and reduce the spread of fungal diseases in the spring. It is my understanding that cornmeal produces a benign fungus that overcomes the disease producing fungal infections. I've noticed that where there a clumps of cornmeal on top of the ground a furry white fungus grows, hopefully spreading spores which counteract the disease causing fungus in the air, and the cornmeal mixed in the dirt is killing the fungus spores there and promoting healthy soil. It's a pretty good fertilizer and weed preventer as well. You can get big bags of cornmeal at feed stores. The roses at San Antonio Antique Rose Emporium all looked good when I was there recently. They say the only thing they spray the roses with is seaweed, which promotes health and vigor and reduces heat stress. They also use natural fertilizers such as compost. That and the good air circulation they have up there in the open keeps their roses amazingly healthy. BTW, I stopped using chemical fungal preventives after reading about possible adverse effects to humans. The wearing of full body coveralls and a mask is recommended when spraying. These are just a few observations in addition the good things suggested by the other posters. Happy gardening! :-) |
RE: Is this Black Spot Disease?
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I appreciate the input (even though I didn't start this post). Carrie told me about the cornmeal - just never got it started before the fall rains set in.
J.D. |
RE: Is this Black Spot Disease?
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There are many chemical treatments for roses with the
dreaded blacksot. We used to use chlorthalanil for fruit
trees but that is outlawed for homeowners now. As a
certified organic gardner I still use some chemicals
and organics. The cornmeal etc., work to set
off a chain of organic organisms which contol fungal
growths. These cannot work with excess rain. The one cent coins today have mostely zinc. That is why
you get good growth from them. Zinc is absolutly neces
sary for growth.
Larry |
RE: Is this Black Spot Disease?
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| Larry, if you're certified organic, how can you use chemicals? Interesting about the penny info. |
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