Analysis on the causes of yellowing and falling seedlings of Orchid leaves

1. In a pot of orchid plants, the outermost leaf of a certain plant gradually yellows from the leaf to the tip, and has a downward extension trend, which can be extended for a month to two months or more, and finally the whole leaf yellows and decays. This is a normal decline phenomenon of old seedlings, which is common in old seedlings after two years of age. The tip of the leaf is scorched yellow and has a slow downward trend. It may take a year for the decline of a leaf to end. This is also normal. However, if the tip of each leaf on the seedling is burnt, it belongs to the damaged root in the pot. It should only be treated when the soil is changed in the right season. It is mainly caused by soil hardening, poor air circulation and improper water supply. 2. The outer bract leaves (protective leaves) of the seedlings, such as orchids growing normally, can maintain the integrity of the whole plant. However, common outer bracts are either withered or shed, forming abnormal light with long leaves (i.e., once-grown leaves) maintaining growth. As long as it is seen by people with a little cultivation experience, it can be judged at a glance that this is caused by poor cultivation management. Generally speaking, the bracts are incomplete, reflecting that the topsoil in the basin is too shallow or the soil on the basin surface is too thick, or the water supply of the basin soil is insufficient. At least the upper half of the basin soil is too dry, and the root system related to leaf protection is damaged. The improvement of this problem can be independent of the influence of time and season, and it will be fine if it can be dealt with in time. 3. Some leaves may be damaged due to physical injuries, and the consequences of injuries are also varied. Some of the veins formed by excessive pressure on the leaves are blocked, half of them are damaged, and the pressed parts of the leaves gradually turn yellow; Some are only folded at the tip of the leaf and cannot recover, and the crease is too deep to recover; There is a tear from the middle, or damaged due to excessive wind and long-term pressure. For these aspects, once found, local pruning, or change the position of the orchid basin on the line. 4. Due to lack of common sense or carelessness, the orchid basin was placed under the clothes dried after washing, and received a lot of dripping of washing water. In about twenty or thirty days, the leaves of the whole basin became yellower day by day, and finally all the orchid plants died. Although this is rare, there are many examples. Once this situation is discovered, it is necessary to immediately clean the orchid plants with a large amount of water, and serious ones must discard the pot soil for replanting; if it is found late, the leaves have been yellowed in large quantities. At this time, in addition to replanting with new soil, it is necessary to cut off the leaves with deeper yellowing degree, trim some roots, or select soilless moss for planting, pay attention to avoiding shade for a period of time, slowly condition and cultivate carefully. 5. Improper watering, whether spraying, irrigation, watering, soaking, sprinkling, try to avoid water into the newly opened leaf buds, flower buds, this time, once received too much water, coupled with poor ventilation, or the temperature is too high and too low, it is most likely to cause rotten buds. If you don't pay attention, at first glance the color of the upper part of the leaf bud has not changed, only feel that the leaf bud does not grow tall for a long time, look carefully only to find that the color of the bud mouth and the lower part of the leaf bud has changed slightly, often brown, at this time as long as gently lift, the leaf bud that has rotted at the bottom is pulled up. 6. Due to planting orchid, the base fertilizer in the pot is too much (including organic fertilizer or chemical fertilizer), and in the short term, the orchid plant is very vigorous, the leaves are oily green, and the new buds grow fiercely. However, after the water is dry, the whole pot of orchid plants will gradually turn yellow, and even completely topple seedlings; or there will be deeper buried orchid seedlings from the center of the seedlings caused by blackening rot, etc. Most of this situation is difficult to recover, this is called fat harm. If found early, it is necessary to re-soil, in the shade and ventilation slowly nurture. 7. Because too many seedlings are planted in a year, the name day is loose and easy to proliferate, the result is contrary to the characteristics of orchid plants with group growth habits, but it is difficult to proliferate new leaf buds and bloom in the next year; regardless of seasonal factors in a year, repeated soil turning and pot changing will also be unfavorable to normal growth and delay the pot period, and poor management will also wither and fall seedlings. 8. In the ordinary cultivation management, if a family only one person to worry about, other people generally do not ask, once this love orchid because of business or because of business, temporarily unable to take care of, had to let the orchid plant resigned, the result fell seedlings, death is inevitable. The way to improve is not difficult, that is, there must be a successor in the family, and there must be no cut-off in the management link, otherwise it will be difficult to persist in the love of orchid lovers. The above various circumstances explain that there are many reasons for the fall of orchid seedlings and necrosis. In addition, there are rat damage and bird damage, which are also headaches. However, most of the factors that endanger the normal growth of orchid plants can be avoided. The problem lies in the daily management. Careful observation should be made. If there is a problem, solve it. Don't rush to rescue the seedlings when they die. It should be noted that impatience and sloppiness are harmful in the cultivation of orchid. Kungfu should be spent in peacetime in order to prevent problems before they occur. I deeply realized in the long-term practice that no matter what the reason is, as long as the situation of falling seedlings of orchid plants occurs, the troubles brought are obvious. It is not easy to restore the vitality of the bulbs after falling seedlings or the "false phosphorus stems" spoken at ordinary times, and it is not easy to talk about economic losses and emotional setbacks. What makes people more annoyed is the waste of time, which is unbearable. From taking bulbs after falling seedlings and rotten roots to re-cultivating bulbs, to re-germinating bulbs and growing roots, It will take 2- 5 years to plant seedlings into pots and finally bloom, if all goes well: it will take 1 -2 years to rescue some fallen seedlings and truly restore vitality. In short, it was something that most orchid breeders did not want to see. But when things come to an end, fear, anger are useless, only to face reality, with a positive attitude to treat, can save the orchid plant from the edge of death, still is the orchid people enjoy the success and harvest after the joy, worthy of every orchid lover to practice, to appreciate the joys and sorrows of orchid cultivation, this is also a learning and exercise process, but also the vast majority of orchid lovers can not avoid the reality.