Cactus is a very tenacious flower, but it also has a fragile side. First, the reason of decay: Decay is the most common failure phenomenon in the cultivation of cactus flowers. The cuttings are not perishable, perishable, grafting is not perishable, and seedlings are easy to rot. Rotting, forming plants will suddenly rot. The causes of decay are manifold and can be summed up in two major categories. One is pathological and the Other is physiological. Pathological rot is caused by infection with pathogenic bacteria. The soil and surrounding environment, water and fertilizers, as well as the tools used for reproduction, have pathogenic bacteria and fungi. If we do not pay attention to disinfection and sterilization, the bacteria can easily multiply in soil and environment and harm plants. Human-created wounds during reproduction, the wounds caused by pests and foodstuffs, and the epidermis of seedlings, as well as the lower parts of the forming plant stems, are often “shortcuts†for bacteria invading plants. When the environmental conditions are conducive to a large number of bacteria, the plants, especially seedlings, often quickly die in batches. Second, prevention and control of rot disease: prevention of rot disease should be the main prevention. First of all, to improve the environmental conditions of the cultivation site, especially the self-rooted planting plants, requires a clean environment, good ventilation, adequate light, moderate temperature, so that the occurrence and spread of pathogens can be greatly reduced. Second, we must strengthen the cultivation and management, do not use mixed organic fertilizer in the cultivation soil, the fertilization material is rather light and not strong. When basin soil water is found, it is necessary to fasten the basin, wash the root system and blow a thousand; if the root system is not discolored, the root hair of the fibrous root is still intact, and can be placed on the semi-shade at the basin for a period of time; some of the root system can be cut off and dried. After the dry wounds are planted, all the bad roots must be cut off, and the wounds are dried and then the hair roots are cut. It must be pointed out that some large plants have grown well and their plant tissues are tight. When pests or other causes cause root destruction, sometimes they do not show much change in appearance, and some can still flower as usual, gradually weakening over time. In the end it will still rot. For this kind of situation, the observation should be strengthened in cultivation, and when there are more pests in the pot, or when the basin soil is not dry after watering, the root system of the plant should be suspected. At this time, the pot removal inspection may also be able to save. Frequent spraying of fungicides on plants or in the surrounding environment has a certain effect on the occurrence of pre-preserved rot disease. The commonly used fungicides are zein zinc (concentration 0.15?0.35%), carbendazim or thiophanate (concentration 0.1%). Once it is found that there is a brownish soft spot on the plant caused by local disease, it should be immediately extirpated, and a part of the adjacent healthy tissue should be dug out, and then coated with sulfur powder or charcoal powder to dry the wound, when the weather is not good A hair dryer can be used to dry the wound and then isolated for cultivation for a period of time. When the partially rotted part is large, the healthy part can be cut, cut, or grafted to partially destroy the disease. If the disease is partially in the upper part, the upper part can be removed first. The lower healthy part is treated as a mother plant. Since the plants around the rickets are likely to be infected again, they should be sprayed immediately and strengthen the ventilation of the environment.
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