Common diseases and insect pests of rose rose and their control

Many rose rose flower lovers will encounter four common diseases of rose rose flowers, such as black spot, powdery mildew, branch blight and root cancer, and occasionally other diseases such as rust, exposure fungus, anthracnose. And so on, but not as serious as the first four diseases. The editor has sorted out the diseases and insect pests of roses and their control methods as follows. I hope they will be helpful to you. If there are any mistakes, I hope you will leave a message:

Diseases and insect pests of rose rose and its control

Rose rose black spot disease

Rose rose black spot disease, caused by Diplocarponrosae, a pathogen of Scutellariaceae, is the most common disease in rose cultivation. It began to occur in the middle and last ten days of May and was the most serious in the period of high temperature and humidity. It occurs in leaves, petioles and stems. When the plant is infected, black round disease spots appear on the leaves, especially the mature leaves close to the ground suffer the most. The diseased leaves will gradually yellowing and fall off. When the disease is serious, most of the leaves of the whole plant fall off, unable to carry out photosynthesis, resulting in poor growth.

The most important thing to control rose rose black spot is to keep the cultivation environment clean, such as cleaning the diseased leaves to prevent fungal spores from spreading again, watering the leaves in the morning as far as possible to keep the leaves dry, and the pathogens are less likely to reproduce and spread. Secondly, pay attention to pruning to avoid the clustering of branches and leaves, and keep the plants well ventilated. Chemical control can be used, such as spraying the whole plant with 1000 times of Laide (Yili), once every 5-7 days, 3-5 times continuously, and it can also treat both rust and powdery mildew.

Diseases and insect pests of rose rose and its control

Rose rose powdery mildew

Rose rose powdery mildew is a fungal disease, which is caused by the pathogen Sphaerothecapannosa. Mainly infected with young leaves, tender stems and buds and other parts, the infection site will appear white powdery disease spots; when severe infection, the leaves will become brittle, atrophied and curled and dry.

The onset period of rose rose powdery mildew is different from that of black spot disease. when the temperature is lower and the relative humidity is higher, the occurrence of powdery mildew is more serious, which usually occurs most in winter. Generally speaking, the disease is most likely to occur in humid climate, poor ventilation and lack of sunshine, so rose cultivation in winter must prevent powdery mildew in order to make roses grow well. The prevention and control of rose powdery mildew is the same as black spot disease, we must pay attention to pruning to keep the plants well ventilated, and avoid planting roses in areas where there is not enough light, or isolating from other plants that are prone to powdery mildew, such as hundred-day grass, Dali flowers, and so on. The selection of disease-resistant varieties can reduce the threat of powdery mildew, or spray the whole plant with 1000 times of Ferrari.

Time: 2019-04-18 Click: