How to prevent and control diseases and insect pests of hibiscus

Hibiscus, also known as hibiscus, is a beautiful ornamental plant. Its flowers are mostly bright red. It grows mostly in the Lingnan area of ​​China. It is also an ornamental plant that can be cultivated at home. However, during the cultivation process, this hibiscus often suffers from diseases and insect pests, so you should pay attention to prevention. So how should you prevent diseases and insect pests for hibiscus? The following editor will tell you in detail.

How to prevent and control diseases and insect pests of hibiscus

1. Prevention and control of hibiscus leaf spot disease

The leaf spot disease of hibiscus mostly occurs when the weather turns cold in late autumn. After the disease occurs, its leaves will appear light yellow or reddish yellow, spots, and the spots will slowly expand. In severe cases, black substances will appear. The best way to prevent this disease is to prevent it. When the wind is strong and the temperature drops in autumn, it should be kept warm in time. After the disease occurs, it can also be sprayed with mancozeb.

2. Prevention and control of hibiscus stem rot

Stem rot is also a common disease of hibiscus during its growth period. It mostly grows in the rainy season and is caused by fungi. After the disease occurs, the roots of the plant will appear dark brown and the subcutaneous tissue will rot. In severe cases, the diseased plants can die. To prevent and control this disease, you should prevent rain from eroding the plants, and spray them with thiophanate-methyl solution in time before and after the rainy season, once every ten days, and the prevention effect is particularly good.

3. Prevention and control of nematodes on hibiscus flowers

Knot nematodes are also one of the most common diseases of hibiscus during its growth period. After it occurs, reddish-brown spots will appear on the edges of the leaves of the plant and spread inward. In severe cases, the leaves will fall off. This disease is particularly difficult to prevent and control. When raising it at home, you can directly change the soil and pots. The new soil must be disinfected by exposure to the sun, and the old soil cannot be used. In addition, some aldicarb granules can be applied to the new soil to prevent the disease from happening again.