What are the diseases and pests of roses? Common diseases and pests of roses

Rose is an ornamental plant that many people like, but during the cultivation period, it is often found to have some diseases and insect pests. These diseases and insect pests will not only reduce the ornamental value of roses, but also cause roses to die directly in serious cases. So how should these diseases and insect pests be prevented in normal times? How should they be treated after they occur? The following editor will talk about this issue specifically for you.

1. Rose powdery mildew

Powdery mildew is one of the most common diseases of roses. After it occurs, the leaves will fall off, the buds will be deformed or unable to open, and it will directly affect the growth of roses. The best way to prevent this disease is to reduce the source of infection, promptly prune the diseased roses and leaves, and destroy them. In addition, after entering the dormant period, Sibamei should be sprayed to eliminate the overwintering hyphae in the diseased buds, which can effectively reduce the occurrence of powdery mildew in roses.

2. Rose black spot

Black spot disease is also one of the most common diseases of roses. After the disease occurs, it mainly manifests itself on the leaves, petioles and oats of roses. In the early stage of the disease, small brown spots will appear on the front of the leaves of roses. As the disease worsens, it will slowly spread into round or irregular spots. The color of the spots is mostly black and purple. To prevent and control this disease, you can completely remove dead branches and leaves in autumn, cut off diseased branches in time and destroy them, and spray pentachlorofen sodium aqueous solution during its dormant period, which can effectively eliminate the overwintering bacteria on roses.

3. Gray mold of rose

Gray mold of roses is also a common disease. After it occurs, spots will appear on the flowers, buds and tender stems of roses. In a warm and humid environment, a large amount of gray mold can form at the site of the disease. To prevent gray mold of roses, in autumn, dead leaves cannot be used to protect the roots. When cultivating in a greenhouse, attention should be paid to ventilation to avoid excessive humidity. At the same time, infected flowers and buds should be removed. After gray mold occurs in roses, 75% chlorothalonil wettable powder can be sprayed, and the drug should be used continuously for 2 to 3 times, which can significantly control the disease.