Symptoms: This is a common disease. At the beginning of the disease, there were spots of different sizes on the surface of the leaves, and then they developed into irregular spots, with dark brown on the edge. In the serious period, the leaves would wither and die, with some small black spots in the middle.
Prevention and control: pay attention to the management methods, keep the soil loose and ventilated, and enhance the resistance to disease. When the disease starts, you can spray the drug methylthiophane, which can prevent the spread of the disease. It needs to spray 2-3 times to completely remove.
Symptoms: red leaf disease is also one of the diseases. At the beginning of the disease, there will be small dark red spots on the mesophyll, and the whole leaf will dry and fall off in the later stage.
Prevention and control: first of all, the disease resistance of the plant should be enhanced to make the plant robust, and attention should be paid to the application of fertilizer. In the early stage of the disease, magnesium sulfate solution can be used to spray leaves, which needs to be sprayed 2-3 times, so the effect is very good.
Rhododendron hybridum occidentalis may infect aphids and cause damage to the leaves and rhizomes of the plants. It can be killed by spraying household insecticides on both the front and the back of the leaves. After spraying for 4-6 hours, spray again with clean water to clean the leaves.
