Lanyou summed up the maintenance of orchid leaves for many years

Since most species of Chinese orchids bloom only once a year, orchid leaves have become an important object of appreciation, and there is even a saying that "viewing leaves wins flowers". The leaves on each pseudobulb of orchid grow out at one time and cannot reproduce new leaves, which makes the maintenance of orchid leaves even more important. The author summarizes several key points of orchid leaf maintenance from years of orchid cultivation practice for your reference.

First, avoid damage caused by pests. Especially in the plum rain season, the middle and lower reaches of the Yangtze River with more rain and higher temperature should pay great attention to the occurrence and spread of waterlogging and diseases, such as scab and white silk disease, which mainly damage leaves and make the front or back of leaves have different degrees of spots, which are difficult to disappear. In severe cases, the whole leaves wither, so we should pay attention to disease prevention.

In early spring, thiophanate methyl mixed with 800 times water or chlorothalonil mixed with 500 times water was used for prevention and control once every 10 days. At the same time, keep the orchid field and tray well ventilated and dense. When orchids have diseases, they should cut off diseased leaves and old leaves in time, and the sharp angle formed after cutting should be less than 30 degrees. Insect damage leaves can be retained as long as the pests are removed. Cut orchids should not be thrown into orchids growing areas, but burned or buried deep.

Second, preserve the leaf tip to prevent the occurrence of the burning phenomenon. The tip of the orchid leaves should be preserved as much as possible and not easily cut off. Once the tip of the leaf is lost, the orchid leaf becomes a sharp sword and appears rigid. The key to leaf tip preservation lies in careful daily maintenance and management. Excessive pot wet, old seedlings easy to coke tip; too dry new seedlings to dry tip; pot overheating, poor ventilation, excessive fertilization, turning when the dry rotten roots are not trimmed clean, plant material is not clean, etc., will cause orchid coke tip. As far as the external environment is concerned, too high or too low air humidity, poor ventilation and sultry heat will also cause coke tip.

In addition, there are bacterial charring head, when the leaves appear spots, if the scissors disinfection is not thorough, cut off when the bacteria will be brought into the wound. The time to cut off the coke tip should be at noon on a sunny and dry day, when the wound heals faster, and it is forbidden to water it after cutting or trim it in rainy days.

The source of the disease is at the root, so to cure the disease, the basin must be turned over, the root source must be cleaned, and the carbendazim powder must be sprinkled directly on the wound. For the blue leaf Jiaojian,"cure" is negative, cure after the leaf has also been disabled. Therefore,"prevention" is positive, to improve management, careful cultivation.

Third, maintain the normal growth posture of orchid leaves, and also keep orchid leaves clean. Orchids in transportation and daily maintenance management work, orchid leaves are easily destroyed by external forces, such as broken, twisted, entangled, etc., so we have to be careful in the operation process. When spraying water, it is necessary to prevent the orchid leaves from turning over due to high water pressure; avoid colliding with the leaves when sweeping the floor; find that the twisted leaves should be straightened out in time to restore their normal growth state; avoid soil, dust, insect urine and bird droppings contaminating the leaves, because once polluted, it is easy to cause leaf diseases for a long time, so once pollution occurs, it should be washed immediately.

Fourth, shade net treatment should be in place. The shade net bracket is generally not lower than 2.5 meters, so as to ensure ventilation. At the same time, the shading index of shading net must reach more than 70%. If shading net with low density is used for a long time, some or all leaves of orchid will turn yellow, and it is difficult to restore their green color. However, the orchid shed should avoid dark and hot, to cover both bright and cool, to feel cool under the orchid shed is better.