What is the disease causing black spots on rose leaves?
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What is the disease causing black spots on rose leaves?
When black spots appear on rose leaves, it may be due to black spot disease. In the early stage of the disease, it presents as small red-brown to purple-brown spots, which gradually expand into round dark spots. Severe cases can lead to leaf withering and falling off. It is necessary to use drugs for prevention and treatment in time after the onset of the disease, such as Bordeaux mixture, thiophanate-methyl, and validamycin, applying twice a week.
Some diseases always occur when raising roses. When black spots appear on rose leaves, it indicates the occurrence of black spot disease. Initially, there are red-brown to purple-brown spots on the leaves, which then gradually expand into round or irregular dark spots. Severe cases can lead to leaf withering and falling off.
For black spot disease in roses, it is necessary to take timely preventive and control measures. If the disease is mild, the affected leaves can be removed and incinerated, then disinfected and placed in a well-ventilated and breathable environment with suitable lighting conditions.
If the black spot disease is severe, it is necessary to use drugs for treatment promptly. For example, you can use wet Bordeaux mixture, thiophanate-methyl, validamycin, or 65% zinc omethasone 500 times liquid, applying twice a week until the disease is completely eliminated.
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