1、 Brown spot

The most common disease of Rhododendron is brown spot, which usually occurs more in late spring and summer. At the beginning of the disease, many small brown spots will appear on the leaves of Rhododendron, and then these spots will gradually expand and turn into dark brown. Sometimes some black mold layers will be formed on the patches of diseased leaves, which will eventually lead to the wilting and withering of diseased leaves

Control method: first, remove all infected leaves and burn all diseased leaves to prevent bacteria from infecting healthy branches and leaves again. Spray tobuzin solution to the plant for sterilization to prevent the spread of bacteria

2、 Leaf swelling

The disease mainly occurs on twigs and leaves. The high incidence period of leaf swelling is when spring and summer alternate and autumn and winter alternate. After the disease, the leaves expand and swell, forming spherical bulges on the leaves. Sometimes there are some white powdery substances in the infected parts. In the later stage, the bulge area gradually expands, and finally the leaves curl and fall off

Control method: cut off all the infected leaves and branches and burn them less before the appearance of white powder, and then spray the plants with jinzhongling for sterilization treatment

3、 Flower rot

Flower rot is a disease that seriously endangers flowers. After the disease, the color of the petals will become light and translucent, and then the disease spots will begin to turn brown and decay gradually, leading to the withering and early withering of the flowers, which greatly shortens the flowering period

Control method: spray tobuzin solution to sterilize when flowering, and cut off the residual flowers as soon as possible after flowering

4、 Shoot Blight

The disease is caused by fungi, which is a difficult disease to treat. After the disease, the branches, leaves and new buds will gradually change color, wither, the leaves will wither, and finally lead to the death of the plant

Prevention and control methods: disinfect the soil before planting, and pay attention to maintaining the looseness of the soil and good drainage. It can be prevented by spraying with soil bactericide

5、 Pest

Staghorn Rhododendron is often eroded by aphids, military mating insects, short whisker mites, scale insects and other pests. Pests generally gather on the leaves to absorb juice, causing leaf wound infection, causing the leaves to wither and fall off, seriously endangering the growth and flowering of flowers

Prevention and control methods: most pests breed in large numbers in hot and humid summer. Drugs can be used to kill insects or remove insects manually. At ordinary times, pay attention to the ventilation and ventilation of the breeding environment, spray drugs in time for sterilization and pest control, and carry out reasonable maintenance and prevention