Rose Black Spot – Diplocarpon Rosae

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Have you been noticing small spots on the leaves of your favorite roses? It’s officially known as Diplocarpon Rosae, but more commonly Rose Black Spot or just Black Spot.  This is one of the most common issues that we will see when tending to roses, although, it can also show up on many other plants as well.

First, they will just appear as a few small black spots on the tops of some of the leaves. But over time, they will increase both in size and quantity. Usually they will first show up towards the bottom of the plant, and then it will work it’s way up. But it’s also worth noting that they really can start anywhere on the plant. It really just depends on the specific conditions that they are living in. 

Leaves are the most vulnerable when they are wet for five to six hours or longer depending on the climate, time of year, and geographical location. Black spot also likes to show up after those longer periods of wet weather. The most severe infections will actually cause the leaves to turn yellow and die.

Rose Black Spot will spore during the winter months in the fallen leaves on the ground. This is why it is so important to keep the base of the plant free of dead leaves, branches, and other plant matter. 


A Few Tips



    1. Make sure to plant your roses in a quality soil with good drainage                                                                 
    2. Keep the ground around the base of the plant clean and free of any fallen leaves or debris                                                                                                                                                                                                                                                                                   
    3.  Throw infected leaves in the garbage and not into the compost                                                                                                                                                                                                                                                                                                                                     
    4. Disinfect your clippers / pruners after each use, especially after dealing with infected plants                                                                                                                                                                                                                                                                                                                  
    5. Water just the base of the plant, not the leaves.  Pretty self explanatory here. Keep that water at the base of the plant. Try not to splash onto the leaves, stems, or branches.                                                                                                                                                                                                                                                                                                                                                                              
    6. Feed with a quality rose fertilizer consistently. Read the manufacturers instructions on how much to feed and how often to feed. They will vary from one brand to another and you do not want to overfeed. You will severely damage the plant if you overfeed and could possibly kill them. 


Each of these options is definitely going to help you to keep your roses healthy and free of black spot, but the biggest thing you can do is to just stay consistent. Check on them regularly until you really have a good idea of what to expect and then don’t slack off! It’s easy to do when you start seeing good results, but you have to stay consistent or else all of your hard work will start to fade. They say if you can do something for 21 days straight then you will have a very high chance that it will become part of your daily routine. Give your rose bush and all of your garden consistent attention and you are going to have great results.

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