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How to prevent and cure rose powdery mildew?

The main results are as follows: 1. Disease-resistant varieties are selected for control, such as rose varieties with high resistance to powdery mildew. Remove the source of the disease, clean up the fallen leaves and burn them in time. Seedlings susceptible to powdery mildew are not cultivated in bed soil that may carry powdery mildew. There is no need for mother plant cutting and ramet with powdery mildew.

2. At the initial stage of the disease, cold water can be sprayed on the leaf surface, which can prevent the growth of mycelium, or 1500-2000 times of topiramate can be sprayed for 3 times in a row to control the disease.

3. the treatment of powdery mildew is mainly through the use of fungicides to prevent the further development of the disease. From the point of view of prevention and control, the following measures can be taken: to select rose varieties with strong adaptability and disease resistance. Clean up fallen leaves and dead branches regularly to reduce the growth of germs.

4. Prevention and treatment: the prevention of ① in advance is the most important measure. The same amount of stone-sulfur mixture should be sprayed before powdery mildew. Once every 7 to 10 days. Be persistent and uninterrupted. 50% methyl topiramate 800-1000 times solution can also be used for control, and the soil surface of the flowerpot can be sprayed together with the flowerpot during spraying.

5. Strengthen ventilation Rose powdery mildew is easy to spread in poorly ventilated environment, especially at night, it is best to keep it in an outdoor position with good ventilation. If it is winter to maintain the rose, it is best to remove all the diseased leaves in bad condition before entering the house, so as to prevent other plants from being affected.

Rose appears "powdery mildew", how to prevent and cure it?

The main results are as follows: 1. Disease-resistant varieties are selected for control, such as rose varieties with high resistance to powdery mildew. Remove the source of the disease, clean up the fallen leaves and burn them in time. Seedlings susceptible to powdery mildew are not cultivated in bed soil that may carry powdery mildew. There is no need for mother plant cutting and ramet with powdery mildew.

2. At the initial stage of the disease, cold water can be sprayed on the leaf surface, which can prevent the growth of mycelium, or 1500-2000 times of topiramate can be sprayed for 3 times in a row to control the disease.

3. Powdery mildew is a plant disease. The crops that are usually harmful are flowers, which can infect the seedlings of woody flowers such as rose, rose and rose.

What are the causes and control methods of rose powdery mildew?

1. Powdery mildew is easy to occur in warm, dry or humid environment, but rainfall is not conducive to the occurrence of the disease. The disease is easy to occur when too much nitrogen fertilizer is applied and the soil is lack of calcium or potassium fertilizer, the plant is too dense, the ventilation and light transmission is poor, and the disease is serious.

2. The root cause of powdery mildew is that the indoor environment is not ventilated, the air is stuffy, the light is not strong, the rose can not receive light for a long time, more soil moisture, frequent watering, excessive fertilization, and the probability of powdery mildew is very high. In fact, there are three measures to prevent powdery mildew. Strengthening ultraviolet radiation under natural conditions is the most effective means to control powdery mildew.

3. In the case of high humidity and poor ventilation, it is easy to breed bacteria infection and cause powdery mildew. When the plant is infected with powdery mildew, a white velvet will appear on the leaves. As the condition of the rose becomes more and more serious, the whole velvet will continue on the whole leaf and the whole plant, while the leaf curls inward.

4. The onset of ℃, 17-25 ℃ is the most suitable, and 30 ℃ is the most suitable. (3) the control method is only to apply more nitrogen fertilizer, pay attention to potassium fertilizer (plant ash), cut off the diseased branches and burn them in winter and early spring, and spray 50% tophan wettable powder 500 times or 50% benzene wettable powder 1000 times during the onset period.

5. Enhanced ultraviolet radiation under natural conditions is the most effective means to prevent powdery mildew. When moving to the sun during the growth of new buds of rose, it is best not to shine through the glass sun. The stronger the ultraviolet, the safer the rose.

6. Today, we will learn about the cause and treatment of rose powdery mildew.

Rose powdery mildew with what medicine, rose flowers how to prevent powdery mildew (picture)

1. Potassium dihydrogen phosphate is a good choice to supplement phosphorus and potassium fertilizer because of its high content of phosphorus and potassium. Many flower friends like to use it, but here is a little bit about how to use it: 2 liters of spray pot generally add 2 grams of potassium dihydrogen phosphate, fully dissolved and then foliar spraying or root irrigation.

2. When powdery mildew is more serious, it can be sprayed and killed directly with drugs. For example, spray 15% trimethoprim 1000-fold solution, 2% antimycin water agent 1000-fold solution, 10% polyantimycin 1000-1500 times solution. Twice a week until powdery mildew is completely eliminated.

3. There is white frost on the leaves of Chinese rose, which is likely to be infected with powdery mildew. The disease has the highest incidence from May to July. You can spray carbendazim solution as soon as possible to deal with it, enhance the ventilation of the maintenance environment, isolate it from other plants, and appropriately increase the exposure time. In addition, pay attention to the humidity in the environment is not too high.

4. Control methods of rose flowers. Pruning and destroying all dead susceptible branches in early spring can reduce the source of infestation. Early diseased leaves should be removed as soon as possible. When growing in greenhouse, ventilation should be increased so that the humidity is not too high. Excessive nitrogen fertilizer should be avoided when applying fertilizer, and phosphorus and potassium fertilizer should be applied appropriately.

5, rose powdery mildew chemical prevention and treatment: generally in the spring and autumn when not sick, if several consecutive days of rain and sunny days to timely prevention, once every 15 days. Powdery mildew medicine is contact killing. To put it bluntly, powdery mildew medicine needs to be sprayed to the diseased place to be effective.