Why are the leaves of the freshly planted downhill orchid old yellow?

The leaves of the orchid are a barometer of whether the orchid is healthy, which can reflect the growth trend and physiological condition of the orchid, the healthy orchid leaves are emerald green, shiny, vibrant, when the orchid has problems, the leaves will appear yellow, black, festering, wilting and other conditions.

If it is the leaves of the old seedlings, and the yellowed leaves belong to the leaves outside the orchid seedlings, the whole leaf starts from the tip of the leaf, and the yellowing and wilting are uniform and rapid, that is physiological aging, which is caused by normal metabolism, also known as weeding, this does not have to worry, if it is the new seedling yellowing, it is caused by the disease, we must pay attention.

In fact, this has nothing to do with the orchid serving the pot, because the time is too short, it takes time to serve the pot, it is a long process, it is ten days and a half months to several years, such a short time can not be expressed, because the false bulb at the base of the orchid leaf has the ability to store water and nutrients, even in a harsh environment, as long as it is not sick, it can be normally supplied to the orchid to grow for a period of time.

If it is found that the new seedlings are yellow, and it happens in a short time, then you have to consider whether it is bacterial soft rot, because only soft rot can make orchids have problems at such a fast speed, it can make orchids die within 1 week, especially in summer, a few days can destroy a pot of healthy orchids, soft rot generally appears more in new seedlings, which is manifested as the leaves of orchids from the inside out, from the bottom to the top quickly yellow, rotten, with a hand to pull out from the rotten part of the short, and the break has a smell.

Soft rot is generally due to the wound of orchid seedlings, and then the wound is not treated, and it is directly exposed to the unclean planting material after potting, at this time, the harmful bacteria or germs in the planting material will invade from the wound of the seedling, so that the reed head of the orchid is infected with the virus, so that the leaves of the orchid quickly yellowing and wilting.

After the orchid is potted, the leaves appear yellow and wilted in a few days, in fact, the pathogen has invaded when the seedlings are divided, but it is manifested when the seedlings are potted, and there is already time for the virus to invade the pseudobulb and destroy the tissues between the seedlings and the pot.

If it is determined that it is soft rot, the infected orchid plant should be cut off immediately, as long as it is a soft disease, it should not only look at whether the leaves are yellow and wilted, but should look at the incision of the false bulb, such as the incision is in the case of dryness, and exposed to the air for 15-30 minutes, if it is yellow, then continue to excise, until the incision of the knife is exposed to the air for 15-30 minutes without yellowing, and keep the color of the excision. Soft rot is very serious, we must pay attention to it, and it is very important to cut more than less.

In addition, the wound of orchid seedlings must be sealed with sterilization, planting materials and pots should also be sterilized and disinfected, it is recommended to cook directly more thoroughly, although soft rot is not contagious, but it is better to isolate it from other healthy orchids after potting, pay attention to facilitate our follow-up observation, or the risk of other diseases.

Because it has just been planted and needs to get used to, after it has been acclimatized for a while, we cut off the yellowed leaves and put them in a sunny place.

This is due to the lack of water and nutrients, as well as the long time spent in the sun, so it is necessary to water them in time, apply fertilizer to the soil, and loosen the soil frequently and put them in a cooler place, so that this can be avoided.

If it lacks water or nutrients, it should be watered occasionally, fertilized to ensure its nutrient intake, and its leaves should be pruned frequently.

There are also two types of improper watering. One is water shortage, and the other is stagnant water. Orchids prefer a moist growing environment, so if there is a lack of water for a long time, or if the humidity of the surrounding air is low, yellow leaves will appear.

At this time, it is necessary to water the orchid in an appropriate amount, and once the soil is found to be dry, it is necessary to replenish the water in time. In addition, the air is drier in summer, so you can put a pot of water next to the plant to increase the humidity of the air. In addition, if there is too much water at the bottom of the orchid pot, it will affect the oxygen intake.

If there is a lack of oxygen, the orchid root system will not be able to absorb the required nutrients normally, so it will cause the leaves to turn yellow and dry and so on. If the situation is not severe, the soil can be loosened to promote water evaporation. If the situation is severe, the orchid can be removed from the pot, the roots can be cut off and transplanted into the new soil.

Light is also important for the growth of orchids. Lack of light can cause poor growth of orchid plants, but if the light is too strong, it is easy to burn the leaves, causing them to turn yellow and fall off. Especially in the hot summer.

Therefore, under normal circumstances, the orchid should be placed under scattered light, and the appropriate amount of sunlight should be received, so that the leaves can be kept in a relatively healthy state, and attention should be paid to ventilation and put in a cool place. Orchids don't like thick fertilizer, so excessive fertilization may easily cause fertilizer damage, the roots will be blackened and cause the leaves of the orchid to turn yellow and die, generally less times and more, to choose a safe electricity slow-release fertilizer, and to stay away from the roots, too close is also easy to burn the rhizome, resulting in the yellowing of orchid leaves. Therefore, how to fertilize more appropriately also needs to do homework.

The reasons for this are sometimes varied. If you pour too much water, it will also turn yellow. Or maybe it's not in the sun. There is also a lack of nutrients, and the soil may be dry, depending on the specifics.

Under normal circumstances, the appearance of yellow leaves may be insufficient water or too much watering, no matter how much fertilization can appear yellow leaves, according to the specific situation to deal with.

The yellow pages appear in order from bottom to top, which may be a certain time, and the soil lacks elements such as nitrogen, phosphorus, and beauty, because nitrogen, phosphorus and magnesium compounds are easy to decompose, ** to the young leaves, so the old leaves will be yellow. Therefore, adding nitrogen, phosphorus, magnesium and other elements to the culture soil provides nutrients for the growth and development of orchids.

The yellow leaves of orchids from the bottom up can be caused by too much watering or insufficient light.

Sometimes the leaves of orchids turn yellow, which may be caused by a lack of fertilizer. The growth of orchids is inseparable from three fertilizer elements: nitrogen, phosphorus and potassium, which are necessary to promote the growth of orchids, and insufficient fertilizers will make its leaves yellow.

In addition, if there is a lack of water for a long time, the leaves of the orchid will also turn yellow. Finally, insufficient photosynthesis is another major cause of yellowing of orchid leaves.

What is the reason why orchids have yellow leaves

Sometimes, no matter how carefully cared for, orchid leaves will show signs of yellowing. Could it be that orchids lack fertilizer? Lack of moisture? Lack of sunlight? Or is it a disease?

Insufficient fertilizer

The yellowing of the leaves of the leaves lacking nitrogen fertilizer is the overall yellowing, and if there is no shortage of phosphorus and potassium elements at the same time, the thickness of the leaves will not be significantly thinned. The solution is to apply nitrogen fertilizer, of course, it is better to use organic fertilizer if possible.

Lack of water

Some orchid friends may be afraid that the orchid will be damaged, and they have not dared to let the orchid receive the sun. Inadequate careAfter a long time, you will find that the orchid leaves have become thinner.

This is because orchid leaves strive to expand the leaf area to receive light in an environment with insufficient light. But this expansion comes at the expense of blade thickness. Therefore, the leaves that lack light are usually thin, soft, and yellow, and the overall feeling is weak.

The whole leaf seems to be spiritless, not to mention the graceful leaf posture.

Disease

There are many orchid diseases, the more common ones are: soft rot, stem rot, anthracnose, white silk disease, leaf blight, etc., they will beAs a result, the orchid leaves are damaged and yellow

Orchid diseases can be roughly divided into two types: fungal and bacterial. Bacterial diseases are easy to judge, and generally the leaves will smell with rot while yellowing.

How to deal with the yellowing of orchid leaves.

1. Supplemental fertilizer

The leaves of nitrogen deficiency fertilizer are yellow, which is the overall yellowing. If there is no shortage of phosphorus and potassium at the same time, the thickness of the leaves will not be significantly thinner. The solution is to apply nitrogen fertilizer, weYou can water the roots with a cake fertilizer solution, and then combinedUrea 500 times fertilizer spray foliage, which can play a very good role.

2. Fill in the light

OrchidsNo less than 3 hours of light per dayAnd the sooner the better. Domestic orchids should increase the amount of light as much as possible while avoiding direct sunlight at noon.

2. Germs

If**Bacterial can use chlorobromoisocyanuric acidIfTreatment of fungi can be done with methyl tobuzin。Of course, carbendazim can also be used, because it is a broad-spectrum fungicide, which has a certain killing ability against bacteria and fungi.

Reasons for the yellow leaves and scorched tips of orchids 1. Too much or too little watering Orchids like humid climates, especially high air humidity. If the water is not enough for a long time and the air is too dry, the roots will dry up and shrink, and the absorption function will be weakened, resulting in a shortage of water and nutrients, resulting in yellowing or scorched leaves. On the contrary, too much watering and long-term wetness of the potting soil are also easy to cause root rot, yellow leaves, and even death.

2. Too strong or insufficient light Cultivating orchids, if they are placed in an improper place, too strong or insufficient light will also cause yellow leaves, scorched tips or leaf edges to scorch. 3. Excessive fertilization Orchids should be lightly fertilized, not thick or raw fertilizer. If the fertilizer is too concentrated at one time, especially if the fertilizer is applied too much, it will often cause root damage, and then cause yellow leaves or scorched tips.

4. Damage to diseases and insects The invasion of orchid plants by diseases and insects will also cause the orchid plant to hurt the leaves and roots, and eventually the yellow leaves and scorched tips will appear. In addition, the pH of the culture soil is not suitable (the soil is alkaline), the long-term unfertilized or unrepotted soil, and environmental pollution are easy to cause yellowing and yellowing of orchid leaves or scorching of leaf edges. Preventive measures for orchid yellow leaves and scorched tips 1. Watering should be scientific According to the season, growth and development stage and the dryness and wetness of the potting soil, etc., decide whether to water and how much water, especially pay attention to increasing air humidity and avoid over-drying or long-term over-wet water accumulation in the potting soil.

2. Fertilization should be reasonable, thin fertilizer should be applied skillfully, and thick fertilizer and unrotted liquid fertilizer should not be applied. The next morning after fertilization, water should be poured once to dilute the fertilizer and avoid the occurrence of fertilizer damage. 3. The light should be suitable for orchids like semi-shade, in addition to the early spring and winter to see more sunlight, people should take shading measures in time after summer, avoid direct sunlight, and it is best to put it under the shade or in the shade of the building for maintenance.

4. Timely prevention and control of pests and diseases It is necessary to prevent diseases and eliminate pests as soon as possible, especially to pay attention to the prevention and control of anthracnose, black rot, scale insects, etc. 5. The soil should be appropriately selected to be slightly acidic, loose and fertile culture soil, and pay attention to changing pots and soil in a timely manner, and regularly apply a ferrous sulfate solution to keep the potting soil slightly acidic.

First, the environment is not adaptable.

Cause: If it is an orchid that has just been bought, when it is planted, it will be unsuitable for the living environment, which will affect the absorption of nutrients by the plant, and the leaves will naturally turn yellow.

Solution: You don't need to worry too much about this situation, as long as you maintain it normally, and wait until the plant adapts to it.

2. Improper lighting.

Cause: If some plants grow normally, but the leaves will turn yellow, it means that the light is generally too strong. If you stay in a particularly shady environment for a long time, the growth of the plant becomes very weak.

Solution: Give the right light, and in the summer, it is necessary to block it in time to prevent the light from being too strong to burn the leaves. Wait until autumn and winter, you can add some light appropriately.

3. Improper watering.

Causes: When breeding, too much water causes water to begin to accumulate inside, and it is in a very wet state for a long time, and the small young leaves that have just grown will turn dark yellow. If the water is not supplied for a long time, the plants will turn yellow.

Solution: According to the normal daily needs of the plant, timely and correct pouring of water.

The reasons why orchid leaves turn yellow and break off from the roots are as follows:Reason 1: If it is a plant that has just been bought, then it is likely that there will be some growth problems with the orchid due to transportation.

Reason 2: If you put an orchid in a place where the air is not well circulated, and when you water it, there is a lot of water, it is prone to soft rot, and the main symptoms are from the leaves to the roots to become dry.

Reason 3: Orchids are plants that are more afraid of waterlogging. Orchids are also prone to this problem if they are exposed to excessively humid and waterlogged soil for a long time.