Pest control of rhododendron

Leaf swelling disease

As rhododendron is also a kind of rhododendron, so it is easy to suffer from leaf swelling disease is still relatively high, spots may appear on the front or back, serious stems and leaves will be swollen, serious, it looks like a biscuit. The disease is most likely to occur from March to May. When there are symptoms, first of all, remove the diseased leaves, but the removed leaves should not be casually thrown, it is best to burn them, so that they will not be infected, and then spray them with special agents.

Leaf spot disease

The disease is still quite common. You can guess the disease when you see the name of the disease. It is a disease spot growing on the leaves. After you encounter the disease, as in the case above, first take off the leaves and burn them, and then protect the plants that have not yet caused the disease. Spray regularly, every 10 days, for a total of 7-8 times. If you are afraid that the leaves will turn yellow, you can add a little ferrous sulfate to it.

Crown net bug

This kind of insect is also relatively common, although this plant is poisonous, but it does not affect the survival of the seed, they are mainly concentrated on the back of the leaves, so that the whole back will change color. If the prevention and control is not timely, the whole leaves may turn white and the leaves may wither and fall ahead of time, so observe carefully. To prevent it before planting, you must first remove all the weeds and fallen leaves from the soil, and then kill all the overwintering eggs with chemicals. If there are symptoms, the diseased leaves should be removed in time, then disposed of, and then treated with specific drugs.

Red spider

This is also a more common category of diseases and insects, some spots will appear on the sucked leaves, when the smoking is serious, the whole leaves will wither and fall, and the higher the temperature, the more likely to appear, especially when it is dry and hot. But the rainy weather is not so serious, so it is necessary to replenish the water in time. It is necessary to kill diseases and insects in time in winter, and continue to spray when harm occurs in March.