Leaf swelling

As Rhododendron is also a kind of Rhododendron, it is easy to suffer from leaf swelling. The spots may appear on the front or back. In severe cases, the stems and leaves will swell. In severe cases, they look like a biscuit. The probability of this disease is the highest from March to May. When symptoms appear, first remove the diseased leaves, but don't throw the removed leaves casually. It's best to burn them so that they won't be infected, and then spray them with special medicine

Leaf spot

This disease is still common. You can guess the disease when you see the name of the disease. It is a disease spot growing on the leaves. After encountering the disease, as in the case above, first take off the leaves and burn them, and then protect the plants that have not developed the disease. Spray the medicine regularly, once every 10 days, a total of 7-8 times. If you are afraid that the leaves turn yellow, you can also add a little ferrous sulfate

Crown net bug

This kind of insect is also common. Although the plant is poisonous, it does not affect the survival of the seed. They mainly eat on the back of the leaves, making the whole back change color. If the control is not timely, the whole leaf may turn white and wither in advance, so we should observe it carefully. To prevent it before planting, first remove all weeds and fallen leaves in the soil, and then kill all overwintering insect eggs with medicine. In case of disease, the diseased leaves should be removed in time, and then treated with specific drugs

Starscream

This is also a common kind of diseases and insect pests. Some spots will appear on the ingested leaves. When the ingestion is serious, the whole leaf will wither. The higher the temperature, the more likely it will appear, especially when it is dry and hot. But the rainy weather is not so serious, so we should replenish water in time. In winter, diseases and pests should be killed in time, and spraying should continue when harm occurs in March