1, gray mold
Roses are vulnerable to pests and diseases in the growth process, and the common disease is gray mold. Gray mold will cause water spots on rose leaves in the early stage. If it is not treated in time, it will turn into gray mold spots in the later stage. After the rose gets gray mold, it needs to be sprayed with cycloserine, procymidone or Baolian.
2. Powdery mildew
Rose grows in unsuitable environment, which is prone to powdery mildew and aggravates its disease. In the early stage of the disease, white powdery mildew will grow on the leaves of Chinese rose, which will dry or curl the leaves of Chinese rose in the later stage. When roses get powdery mildew, they can be sprayed with carbendazim, scallops or tebuconazole to get rid of the disease.
3. Black spot disease
The growth period of Chinese rose is in high temperature and closed environment, which is prone to black spot disease. In the early stage of rose disease, brown spots will grow on the leaves, and then the spots will turn black and spread to the branches. After the rose gets black spot, it can be sprayed with carbendazim, chlorothalonil or Guoguang liquid to get rid of the disease.
4. Rust leaf disease
Roses can also get rust leaf disease after being infected by germs. In the early stage of the disease, the leaves of Chinese rose will grow yellow or yellow-red spots. If not treated in time, the lesion will expand in the later stage, and the rose leaves will turn yellow, dry or fall off. When roses get rust leaf disease, they need to be sprayed with chlorothalonil, mancozeb or carbendazim to get rid of the disease.