What Causes the Black Spots on the Leaves of Rose bushes
Let me tell you about the topic related to why the leaves of rose bushes turn yellow with black spots, a topic about flowering plant cultivation. Please refer to the detailed introduction below.
What Causes the Black Spots on the Leaves of Rose bushes
If the leaves of rose bushes turn yellow with black spots, it might be due to a leaf spot disease. It is necessary to cut off the yellow leaves with black spots to prevent infection of other healthy branches and leaves. It is also important to spray the rose with fungicides like carbendazim to eliminate the pathogens. Moreover, you can change the planting soil to a sterile one to help the plant recover and grow healthily.
1. -- Leaf Spot Disease --
If the leaves of rose bushes turn yellow with black spots, it might be because of leaf spot disease. You need to select a sharp pair of scissors, disinfect them, and then cut off the yellow leaves with black spots from the rose plant to prevent infection of other healthy branches and leaves. After pruning, you can apply some plant ash to the wounds to help them heal.
2. -- Spraying Fungicides --
After pruning the rose, you can spray fungicides on it. First, purchase Bordeaux mixture or carbendazim wettable powder and pour it into a spray bottle. Then, add water to the spray bottle, shake well to mix, and spray the diluted solution on the entire plant to eliminate the pathogens.
3. -- Changing the Soil --
If the roots of the rose also show signs of blackening, it indicates the presence of bacteria in the soil. You can dig the rose out of the soil, cut off the blackened parts of the roots, soak them in a carbendazim solution for half an hour, and then plant the rose in sterile soil.
4. -- Ventilation --
To prevent the rose from suffering from diseases again, it is necessary to ventilate and aerate the plant regularly during cultivation, improving the ventilation between the plants to prevent the growth of bacteria. You can also place the rose in a warm, sunny environment to ensure the plant gets adequate sunlight and enhance its disease resistance.
This article shares all the information about why the leaves of rose bushes turn yellow with black spots, for everyone to learn and understand!