How can i get rid of black spot on my rose bush?
Question:is there anything i can buy?
Answers:
There are many sulfur solutions you can buy to spray your roses down with. I pinch all the pennies I can though, so to save you a trip to the store, try this mixture... it has worked for me:
1'st you have to get rid of all the leaves and stems effected. Prune them off. Don't leave the clippings or dead leaves at the base of your roses. rake around your bush, remove all the mulch, and get it far away from your rose. The spores that cause black spot stay in the dropped leaves, and will effect your rose over and over. Black spot needs moisture to spread. Be sure your rose has good air circulation. If you have a bush, go into the center of the bush and prune stems and leaves back so the air can circulate there better.
2'nd, mix up your solution: 2 tsp baking soda, 1 gal. water, a drop of dish soap. Mix together and spray your rose with it, making sure to get it on the undersides of the leaves since the spores attach there.
Do this whenever you see the first signs of blackspot.
3'rd: a little bit of common corn meal ammended in your soil can help the fungi from growing...this also works for powdery mildew.
4'th: lay down fresh clean mulch. When you water your roses, be sure to water the ground around your bush, and try not to cause the water to splash up onto the foilage, as that is known to help the blackspot travel.
I hope this works for you as well as it has for me! Good luck ;)
It is probably blight, due to high humidity. A safe thing I like to use is sulfur. Get it in any garden and spray it on the leaves.
I like to get sulfur pellets and dilute them into a spray bottle, instead of the spray. That is because I also sprinkle the sulfur on the soil.
Give it a heavy prune back and cut away all affected areas and put it straight away in the bin, away from the plant. If this fails to work, you should be able to by some powder you can sprinkle over your plant to help get rid of it. Cheers and good luck.
Black spot is a common fungus that infects rose plants. All diseased canes should be pruned back to healthy wood and discarded. Reinfections can be minimized with proper fall clean-up. Remove dead leaves in fall where the fungus can overwinter. Do not overhead water. Do not water late in the day or in the evening. Mulch around the base of your roses, this can help to prevent rain from splashing spores up onto the leaves. Black spot fungus is a disease that likes warm temps and humid conditions. Providing good air flow to your roses will help prevent the disease. Disease resistant roses are available. Fungicides are available for the control of Black Spot (Captan, Chlorothalonil, Copper, Lime-Sulfur, Mancozeb, Sulfur, Thiophanatemethyl, Triforine) but remember that all fungicides are preventative. They must be applied when the weather patterns favor the disease but before the symptoms show on your leaves.
In 1999, a Brazilian scientist found that milk helped control powdery mildew on cucumbers just as effectively as a synthetic fungicide. Since the study was published, the news has traveled around the world and encouraged gardeners and farmers alike to try milk as a fungal control for a variety of diseases. So far, there has been success reported on the use of milk to control powdery mildew on a variety of different plants. In addition, it has also been found to be an affective preventative control of black spot on roses (but not a cure once infected).
Any type of milk can be used from full milk to skim to powder. However, the low fat milks have less of a chance of giving off any odour. The recipe calls for milk to be mixed with water at a ratio of 1 part milk to 9 parts water and applied every 5-7 days when weather patterns favor the disease, but before signs show on the leaves.
Here are a few good links that provide further info on the control of Black Spot: http://www.urbanext.uiuc.edu/tips/tips/b...
http://www.ext.vt.edu/pubs/plantdiseasef...
http://www.extension.umn.edu/distributio...
http://www.rhs.org.uk/advice/profiles060...
Milk will get rid of black spot, which is a fungus. Use it as weak as a 1 part milk to 9 parts water. It has potassium phosphate, which boosts the plant's immune system which helps a plant fight off fungi. It has been found to be more effective than the standard chemical fungicides.
I bought infected roses for $2 from two stores. Picked off & discarded all the diseased leaves & sprayed on a weak milk & water solution. I watered only in the morning so the leaves had time to dry.The roses grew new healthy leaves & blossomed beautifully. It's now a yr. later, & not a sign of black spot & the roses are healthy!
As a preventative, I also used a solution of :
1 Tablsp of baking soda with a gallon of water and a few drops of vegetable oil.
Milk is a natural germicide. In addition, it contains several naturally occurring salts and amino acids that are taken up by the plant. From previous experiments using sodium bicarbonate, potassium phosphate, and other salts, researchers have found that the disease is sensitive to these salts.
It's important to clean up fallen leaves & allow good air circulation around plants. Even the suposedly black spot resistent Knockout rose had black spot by Sept. when it was crammed together in a display at Home Depot. But heck, I was able to buy their $9.99 rose for $2, & by using milk, water & baking soda, I now have healthy roses. LOL
Other Methods of control: (which I haven't used)
Sulfur powder as a preventative.
Dormant oil or Bordeaux mixture when plants are dormant (usually in winter).
Two pounds of cornmeal worked into the soil for every 100 square feet, once a year. Watering activates the fungus killing properties. I'm going to try mixing a handful of cornmeal around my plants next. :)
Good luck treating your roses!
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