If you raise Rohdea japonica at home, you will encounter yellow leaves. Don't worry about it at this time. First make clear what the cause is, and then take the right medicine to solve the problem.
For a long time, Rohdea japonica did not apply nitrogen fertilizer or change basin to change water, and the lack of nitrogen and other nutrients in the water led to the thin and yellow branches and leaves. If it is hydroponic Rohdea japonica, it is necessary to change into new culture water in time and gradually increase the application of thin and mature liquid fertilizer or compound flower fertilizer.
If the fertilizer is applied too much, the new leaves of Rohdea japonica will be thick and uneven, and the old leaves will be scorched and yellow, so the fertilizer should be stopped immediately, and the amount of water should be increased, so that the fertilizer will be lost, or immediately poured into the basin, and then replanted after the bulb is washed with water.
If the flowers are put in the high temperature to let the strong sunlight directly, it is easy to cause the young leaf tip and leaf edge to scorch, or the leaf yellow to fall off. Move to a cool place with good ventilation in time.
If you put flowers in shade or lack of light for a long time, it will cause yellow branches and leaves.
Due to the lack of soluble iron and other elements that can be absorbed by the water, Rohdea japonica leaves will gradually turn yellow. Acid soil and water shall be selected for planting, and alum fertilizer water shall be frequently poured during growth.
If the nitrogen fertilizer is applied too much, the ten thousand year old green branches and leaves grow too luxuriant. In addition, they are not pruned for a long time, which results in the lack of light in the branches and leaves of the inner bore, and it is easy to cause the leaves to turn yellow and fall off. We should apply fertilizer reasonably and strengthen pruning to make it ventilated and transparent.
When the indoor air is too dry, the flower often appears the phenomenon of withered leaf tip or scorched leaf edge. Attention should be paid to water spray, plastic film cover and other methods to increase air humidity, to prevent the occurrence of yellow leaves.
In winter, when the room temperature is too low, the flowers are damaged by cold, which causes the leaves to turn yellow and die of withering. If the room temperature is too high, the transpiration of the plant is too high, the root water and nutrients are in short supply, and the leaves will turn yellow. Please pay attention to adjust the room temperature in time.
The leaf spot disease caused by fungus and other pathogens is easy to cause local necrosis and yellow spots or plaques in the leaves. In serious cases, the whole leaves will wither and fall off. After being infected by mosaic virus, there will be yellow and green inlaid spots on the leaves, and it will be damaged by scale insects and spider.
Excessive concentration of pesticides used in the prevention and control of diseases and insect pests, or polluted by toxic gases in the atmosphere, or suddenly irrigated with cold water when the temperature is high, etc., are easy to cause yellow and scorch of the leaf tip or the leaf surface, or even the whole plant dead. Therefore, we should pay attention to the rational use of pesticides and try to eliminate air pollution sources. Avoid watering flowers with cold water around noon in midsummer.
The yellowing of Rohdea japonica leaves is sometimes caused by one cause, but most of the time by many factors. Therefore, we should make a correct diagnosis before we can prescribe the right medicine.
