How To Control Black Spot And Fungus On Roses?

Filed Under: Roses, Restoration, Flower Gardens, Diseases and Fungus · Keywords: How To, Control, Black Spot, Fungus, On Roses · 1378 Views
my roses have black spots and losing leaves how do i make them healthy


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Answer #1 · Gardenality.com's Answer · Keep a chart of when you spray roses with fungicides. You should spray your roses with a fungicide on a schedule of every 10 to 14 days. This is easy to do if you keep a sprayer on hand that is specifically for fungicides.

Use a different fungicide every other week to make it less likely that the your roses will build up a resistance to one particular kind of fungicide.
If any leaves on your roses develop black spot, or start to turn yellow from a disease, pull them off and discard them. Any diseased leaves that have fallen to the ground should also be removed and discarded. The onset of black spot is usually caused by too much water on the leaves, either from nightime irrigation or during extended overcast periods when the dew is not dried off by the sun. Make sure to water roses in the early morning, or water them by hand at the base. Watering in the early morning will allow for the sun to dry the leaves. Avoid getting the leaves wet in the late evening.

Manzate is one good chemical useful for killing black spot spores. If black spot spores are present, you must first eliminate them by picking diseased leaves off.

Regarding mildew, powdery mildew, good air circulation is the best preventative measure. Space you roses sufficiently in the garden to prevent mildew and other diseases. Proper spacing of roses in the garden help to keep plants dry, not allowing disease spores to take hold. Aside from Manzate, Compass and Banner-Maxx are two other good fungicides. These are quite expensive chemicals, however the the bottle goes a long way because of the small amount needed to mix solutions. If you cannot find these fungicides or don't want to afford them, any 'broad spectrum' fungicide listed for use on roses will do.

Alternatively, you may choose to use an organic product, such as those containing Neem oil, to control fungus on your roses. Neem oil also prevents, controls and kills many harmful insects. Whatever fungicidal product(s) you use, remember to switch the type at least every other spraying.

Hope this helps!)



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Answer #2 · Gardenality.com's Answer · I plant a lot of roses in my landscape...not in a rose garden but here and there in landscape beds. I'll give a rose a couple years to fight off the black spot but if it continues to get the disease, and defoliate time after time, I get rid of it. Sometimes roses will fight off and build a natural resistance to the disease and then go on to grow healthy for many years to come. For me, there's just too many roses out there that don't have the disease problems and it's nice to not have to constantly be spraying them. That being said, if you don't mind spraying, it does widen the number of varieties you can successfully grow.)



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