Abstract: Why did the rose leaves at home suddenly turn white? Do you have some strange disease? Don't worry, let me reveal this mystery to you! The leaves of the rose are turning white, which is not a good sign. It may be that the rose has powdery mildew. This powdery mildew sounds like a headache, it can...
Why did the rose leaves at home suddenly turn white? Do you have some strange disease? Don't worry, let me reveal this mystery to you!
The leaves of the rose are turning white, which is not a good sign. It may be that the rose has powdery mildew. This powdery mildew sounds like a headache. It is a major nemesis of rose flowers! So, what disease is the white leaves of rose? Don't worry, let me give you a detailed explanation. The "true face" of powdery mildew
powdery mildew, as the name suggests, is a layer of white powder on the leaves. This layer of white powder is actually the spores of pathogenic bacteria. They will attach to the leaves and absorb nutrients from the plant, causing the leaves to turn white and wither, and in severe cases, even causing the entire plant to die. The "modus operandi" of powdery mildew
The pathogen of powdery mildew is a fungus that likes warm, humid environments. During the rose growing season, if the weather is hot and rainy, it can easily cause powdery mildew. In addition, if roses are exposed to poor ventilation and insufficient light for a long time, powdery mildew can also be easily induced. "Symptoms" of powdery mildew
Rose leaves turn white, which is the most obvious symptom of powdery mildew. In addition, you will also see the following symptoms:
White powder appears on the leaves, which are actually spores of the pathogenic bacteria.
The edge of the blade is curled, the blade becomes thinner and the color becomes lighter.
Brown or black spots appear on the leaves, which gradually expand, eventually causing the leaves to wither.
Plants grow slowly and flowers decrease. The "Prevention and Control Method" of Powdery Mildew Now that we know the symptoms and causes of Powdery Mildew, how should we prevent it?
1. Improve the environment: Keep the rose growing environment ventilated and transparent, and avoid being in a humid and sultry environment for long periods of time.
2. Reasonable fertilization: Apply appropriate amounts of nitrogen, phosphorus and potassium fertilizers to keep the soil fertile and enhance the disease resistance of plants.
3. Timely pruning: Cut off sick leaves and branches in time to reduce the spread of pathogenic bacteria.
4. Pharmaceutical prevention and treatment: In the early stages of the disease, the following agents can be used for prevention and treatment:
Bordeaux mixture: This is a traditional fungicide that can effectively prevent powdery mildew.
Mancozeb: This is a broad-spectrum fungicide that has a good control effect on powdery mildew.
Chlorothalonil: This is a highly effective and low-toxic fungicide that has a good effect on powdery mildew. "Preventive measures" for powdery mildew Prevention is better than treatment. Here are some measures to prevent powdery mildew: 1. Choose disease-resistant varieties: Choosing rose varieties with strong disease resistance can effectively reduce the incidence of powdery mildew.
2. Reasonable close planting: Avoid plants being too dense and maintain ventilation and light transmission between plants.
3. Timely elimination of sick and disabled bodies: Remove sick and disabled bodies in a timely manner to reduce the spread of pathogens. 4. Strengthen management: Regularly inspect plants and deal with diseased plants found in a timely manner.
The leaves of the rose are turning white, which is not a good sign. It may be that the rose has powdery mildew. Understanding the symptoms, causes and prevention methods of powdery mildew can help us better prevent and treat powdery mildew and allow roses to thrive!