What's wrong with the black pole of the rose? Several situations to help you analyze.

Many flower friends who raise roses often react to such problems. They don't find any diseases and insect pests in their roses. How can the branches turn black? I believe many people are puzzled by the problem of black pole appearing in rose, and I don't know what to do. In fact, rose black stem can be divided into several cases, according to different reasons for the corresponding treatment.

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In the first case, the rose got dead branch disease. Dead branch disease is also called rose stem ulcer disease. If the disease occurs, brown or purple-brown spots will appear, and in severe cases, it will turn black, and then dry up and die. Rose poor growth or excess fertilizer is easy to get this disease, especially in high temperature and humid conditions, so summer is the high incidence season of rose black stem.

The second condition, rose from top to bottom black pole. This situation is more common after pruning branches and leaves. At this time, you can carefully observe whether the black stem is a cut just after pruning. This situation is mostly the incision has not been timely sterilization treatment, coupled with the incision encountered water or air humidity, it is easy to infect the disease.

In order to improve the resistance of roses and reduce diseases and insect pests, we must pay attention to supplementing nutrient solution for roses, rich in nitrogen, phosphorus and potassium, adding various organic matter, minerals and amino acids to promote the growth and flowering of roses and improve resistance.

The third case, rose from bottom to top black pole. This condition is usually more severe, and it is most likely that there is a problem with the root system, which begins to rot from the root and then spreads upward to the rhizome. If you don't take timely measures, the whole plant may die.

Knowing the cause of the rose black pole, you can prescribe the right medicine. In the first case, the black stem should be pruned off first, and then the plant should be treated with medicine. Can choose 50% carbendazim 800-1000 times solution, or with 0.2% zinc and 0.1% benzolide mixed, spray on the plant, generally two or three times after medication can be cured.

For the second case, immediately trim off the blackened branches and make cuts. Disinfect the incision with carbendazim or seal with wax. Move potted plants to ventilated and sunny places, which is conducive to incision healing and reduces incision infection rate.

For the third case, the whole rose should be removed from the pot, the soil shaken off or washed with water roots, observe the condition. Rot or necrotic roots should be cut off or pruned immediately, and branches and leaves that have turned black or fallen off should also be pruned (in any case, the situation has already been such that the dead horse can only be treated as a living horse).

After pruning, spray the plants with carbendazim, and the roots can be fully sterilized by soaking. After that, change the soil and basin, and increase the proportion of coarse particle medium. Then the potted plant will be placed in the shade maintenance, to be served after the plant can be moved to the balcony to accept sunlight.