Causes and Countermeasures of Yellow leaves of Orchid

The mid-spring season is the rapid breeding period of new buds of orchids. It is no exaggeration to say that it is the same every day. If you don't believe it, you will observe it every morning. You must have some feelings. I watch it three times a day, and I don't get tired of it. I get something every time. Watching the new buds of orchids unearthed one after another, not to mention how beautiful they are, a sense of achievement and pride immediately welled up in my mind. The pure white, milky white, lilac, deep purple, bright red, water red, mercury red, yellow and white, flesh, green all kinds of new buds dazzling, really colorful sprouts for spring show grace, make people linger and forget to enjoy it. While enjoying the beautiful sprouts, there is also a phenomenon that harms the scenery, that is, yellow leaves. Many new orchid friends are often very worried about this, so I would like to talk about some of my views here, hoping to give some help and inspiration to the new orchid friends. An overview of the yellow leaves of metabolism the lifespan of orchid plants is generally about 5 years, and very few can grow to 7 years. While the number of new seedlings increases with the increase of age, the "ancestral grass" will choose to "leave" at the appropriate time. This "leave" time, 80% will choose in mid-spring, 20% will choose in mid-autumn, this is also the orchid new and old "legal" day. Look at "Sun Dai Cao" thrive, it is "ancestral grass" early retirement "leave the post" in exchange for. Therefore, the master of orchid cultivation often adopts the method of forcibly dividing plants to make the retiring "ancestral grass" serve for another half a year to a year or more. Of course, this can only be done on the premise that the false bulb is full and strong enough to meet certain requirements. Mr. Zhou from Shengzhou, Zhejiang Province can make the "ancestral grass" meet the requirements of about two generations of seedlings, it can be seen that Mr. Yilan is highly skilled.

1. The metabolic occurrence of yellow leaves in old grass is an instinctive measure taken to reproduce the germination of the next generation of new buds, mainly to cut off its function of absorbing nutrients so as to ensure the healthy growth and development of new buds. A large number of times occur in the spring and autumn when new buds sprout. The occurrence rule is that the lowest leaf of the oldest plant begins to yellowing, and then extends from the leaf tip to the petiole to the whole leaf. Most of them are yellowish, turning to brownish yellow over time, and no matter how long they are not artificially trimmed, they will become brittle and easy to break at the ring. No matter whether there is a ring or not, the old orchid leaf will wither down one after another, and end its whole process. This cycle of metabolic performance, for many years of Yilan master can easily cope with. The main reason is that the novice does not understand and get nervous, always wondering if there is something wrong with the orchid.

2. With the increase of temperature in late spring and early summer, the new grass that did not grow last year will accelerate its growth. At this time, some orchid friends like spray humidification, if not blow-dry in time, there will be a "suction" situation. The law of water injury of yellow leaves starts from the central leaves of new grasses, and rarely from the central leaves of old grasses.

3. The yellow leaves of yellow leaf diseases are generally yellowish brown, and most of them are invasive diseases caused by harmful bacteria. The law of this kind of disease also spreads from the lowest leaf from the leaf tip to the petiole. the difference is that both the old and young leaves have the possibility of the disease. Do a good job in the environmental hygiene of the orchid room and apply preventive medicine regularly. The application of beneficial microorganisms in orchid room can effectively prevent the occurrence of infective yellow leaves.

4. The yellow leaves caused by element deficiency can be summarized into physiological yellow leaves. It occurs from time to time during the growth of new leaves, mostly caused by the lack of certain trace elements, which is called "chlorosis". The law of the disease is to start from the middle of the new leaf, where the loss of green is yellow and the color contrast is large. Symptoms: the green area is smooth and glossy through the back of the leaf and returns to normal color as the leaf gradually matures. In the early days of the disease, many orchid friends will mistakenly think that they have "Bailas". In fact, there is a fundamental difference between "Bella" and "Belas".

Third, strengthen the effective management of fertilizer, water and medicine. To sum up, several kinds of yellow leaves are caused by different reasons. Now let's talk about the effects of fertilizer and water on yellow leaves: 1. In the case of ancestral grass promoting bud alone, fertilization must be thin or not, and thin fertilizer should be applied appropriately after the new seedlings grow roots. Some orchid friends have made an experiment that when the ancestral grass promoted the bud, the tube fertilizer was the same as the strong grass, and the results showed that the ancestral grass accelerated the yellow leaves and fell the seedlings, which indirectly affected the rejuvenation of the new buds. 2. To reduce water spraying and humidification by other ways to prevent the occurrence of central yellow leaves due to water injury. 3. To prevent diseases, drugs should be used alternately to achieve the best prevention effect and prevent orchids from becoming drug-resistant. 4. Organic fertilizer is mainly used, supplemented by inorganic fertilizer or bacterial fertilizer. Hormones should be strictly controlled not to be abused to reduce the occurrence of element deficiency.