Do you really need to cut off the leaves when roses are infected with black spot?
Is it really necessary for most women to cut off the leaves when roses are infected with black spot, and to剪 off leaves when roses are affected by diseases and pests? Let's find out together.
Recently, there has been a lot of rain, and many rose enthusiasts have had their roses infected with black spot to varying degrees. What should we do when roses are affected by diseases and pests? Many rose enthusiasts' first reaction is to cut off the leaves with diseases and pests.
Many experienced gardeners also teach us to do this, such as picking off leaves with black spots on roses and picking off leaves infected with red spider mites. Don't know if you do the same?
Do you really need to cut off the leaves when roses are infected with black spot?
When roses are found to have black spot disease, should the leaves be cut? It is believed that the situation should be treated differently.
Early Stage of Black Spot Disease
Do you really need to cut off the leaves when roses are infected with black spot? When you discover black spot disease in roses and only individual leaves are infected, you can remove the leaves. Removing the leaves is equivalent to blocking the source of infection of the black spot disease pathogen, which is very beneficial for the prevention and treatment of black spot disease. After removal, you should immediately spray with a fungicide for prevention and treatment.
Moderate to Severe Stage of Black Spot Disease
But if you find that roses have black spot disease and many leaves are already infected, Green Enthusiast Network suggests that you directly spray the medicine for treatment and not cut off the leaves anymore. At this point, 1/3-1/2 of the leaves have been infected with black spot, and even a large number of leaves have fallen off. If you cut off the leaves infected with black spot, there will be few leaves left on the rose.
The problem is that removing the diseased leaves does not solve the problem. On the contrary, removing a large number of leaves can lead to a decrease in the photosynthesis of the rose, affecting the overall growth of the rose and making it weaker.
So for moderate to severe black spot disease in roses, as long as you persist in using medicine to kill the pathogen, it will be fine. The leaves of the rose, both front and back, should be sprayed with the medicine, and the surface of the potting soil should also be sprayed with the medicine for comprehensive sterilization.