There are five common diseases of Knock Out roses and one serious virus that they now must also deal with. The five common Knock Out rose diseases are: Black Spot Fungus.
When I was researching we ran into the question “Why are my knock out Roses Dying?”.
All roses, even the beautiful and hardy Knock Out, can sometimes have problems. While most of these issues will not kill the plant, they can cause leaf spots, yellowing, wilting and blight that may make it look like the rose is dying . Black spot disease and mildew can still cause problems for Knock Out roses.
One way to think about this is roses will suffer if they have a fungal disease or a pest infestation. If roses don’t get six to eight hours of sunlight per day or are not planted in a well-draining soil that is kept consistently moist, they may develop problems that cause them to die. They may also die if overfertilized.
Some of the primary causes behind wilting of Roses are watering problems, transplant shock, and temperature changes. However, certain pests like aphids can also cause wilting of your Rose plant.
Do knockout rose bushes need care?
The Knockout roses, just like their counterpart roses, do need some care. Earlier I mentioned one other disease problem that Knock Out rose bushes have to deal with now, that heartbreaking disease is called Rose Rosette disease (RRD). The RRD virus is a nasty incurable virus.
You could be thinking “How do you take care of a knockout rose bush?”
Mulch around the base of the rose to hold moisture. All roses, even the beautiful and hardy Knock Out, can sometimes have problems. If left unchecked, these diseases and pests can weaken the plant and make it susceptible to disease and extremes of cold and heat. Knock Out roses should be pruned hard in the spring.
The five common Knock Out rose diseases are: Black Spot Fungus.
Can I plant knock out roses in the same spot?
Once the rose bush contracts the disease, it is best to dig it out and dispose of it. Planting another Knock Out rose in the same location should be fine, though I do recommend replacing the planting hole soil with a good bagged garden soil mix (preferably one that has compost and little to no fertilizers).