(1) specific reasons: it may be caused by unsuitable maintenance conditions. However, there are many factors that can cause the club to blacken. For example, too much water causes the root to rot, and then the stem turns black. It may also be that too much fertilizer is applied or the concentration is too high, resulting in fertilizer damage. There is also the possibility that the ventilation is not good, the whole growth of the plant has problems, and then the pole blackened.
(2) solutions: according to different situations, first determine which link is the problem. Then, symptomatic treatment. If the pole blackening is serious, it is necessary to take the plant out of the pot for a long time and trim the blackened part. Then, select the good part for cutting. However, after cutting, use disinfectant to treat the wound.
(1) specific reason: there is another important reason for the blackening of the pole, that is, the disease. The most likely one is "branch blight". At the beginning of the disease, there will be small spots on the stem. After that. The speckles are expanding, and it looks like the pole is getting black
(2) solutions: when the diseased branches are found, they should be cut off in time and disposed of in time, so as not to let them continue to infect the healthy branches. Pay attention to pruning in sunny days. After cutting, use Bordeaux solution for disinfection. Then, it can be treated with medicine, such as 50% of the concentration of polybacilli.
