Why are the orchids yellow, which friend will answer, please?

Hello, the reasons for the yellow leaves of orchids are as follows:

First, the light is too strong.

1. Reason: Except for a few varieties such as orchids, most orchids do not like strong light. If they are raised in a place with high light intensity, their leaves will be sunburned and turn yellow by strong light.

2. Treatment method: At this time, the leaves that are completely yellowed on the plant should be cut off with scissors. Then, move it to a well-ventilated area without bright light, or use a blackout net to shade it. After waiting for a while, it can be restored.

Second, the temperature is too low.

1. Reason: Orchids like warmth and are not particularly cold-tolerant. If the plant is kept in a particularly cold place for a long time, it will cause it to grow poorly and its leaves will turn yellow.

2. Treatment: First move the orchid to a place with a temperature between 18-25, and then appropriately increase the time it receives light, and wait for it to recover.

3. Lack of moisture.

1. Reason: If you do not water the orchid for a long time when you care for it, it will also cause its leaves to turn yellow.

2. Treatment method: At this time, it should be watered in time. Water thoroughly once first, and water the soil thoroughly, but don't let the soil become waterlogged. Then increase the frequency of watering to replenish it.

The roots should be a problem, it is estimated that the roots are too wet, a little rotten roots, you can spray the rooting agent of Trim Genbido, now the weather is getting cooler, the plant grows slowly, consumes less, and should be watered less, especially orchids, try to dry a little, be sure to ventilate the environment, you may put it at home, the room must be large, there should be a large gap between the plants, don't bask in the sun, don't turn on the air conditioner, the temperature difference is not too big, try to save it, orchids are still more difficult to plant.

1. Shade: After the leaves of orchids turn yellow, they need to be moved to a ventilated and ventilated place of scattered light. 2. Fertilization:

Potassium dihydrogen phosphate or nitrogen fertilizer is applied to orchids once a month to turn their yellow leaves green. 3. Watering: Orchids are not tolerant to stagnant water, so they need to wait for the soil surface to dry before watering.

4. Pruning: Cut off the yellow leaves of the orchid, and then spray it with fungicide.

1. Temperature and sunlight

Orchid leaves are yellow, but can grow normally, a large reason is excessive light, orchids are suitable for growth in 10-25 degrees. At this time, just move the orchid to a cool and dark place. Orchids prefer a semi-shady environment, except for early spring and winter, where they can grow in the sun, they should be placed in a cool place with scattered light at other times, avoiding direct sunlight.

2. Fertilizer application

When the orchid leaves turn yellow and the new shoots are smaller, it is a lack of fertilizer and excessive light, so it should be fertilized twice, and nitrogen fertilizer can be diluted with water. Orchid fertilization is best to use the special fertilizer of orchids, too much fertilization shows that the old leaves and branches turn yellow and fall off, the new leaves are thick but uneven and not stretched, especially in the hot season, too much fertilization can easily lead to orchids being burned.

3. Water volume control

The old leaves turn yellow and fall off quickly, which may be due to overwatering, at this time, you should check the drainage of the soil and whether the roots of the plant are rotten, and change the soil or prune the roots in time. If not watered for a long time, the new leaves will look normal in color, but the old leaves will gradually dry up and fall off.

4. Pest and disease poisoning

Orchid pests and diseases are generally relatively few, so we should pay attention to distinguishing them. Melasma on the leaves is caused by heat in the roots. There are irregular macula on the leaves, which are caused by a virus.

There are small yellow spots on the leaves, which are caused by beetles, and corresponding measures should be taken at this time, spraying pesticides or manual control.

5. Environmentally

At this time, the orchid should be transferred to a place with a suitable temperature and soft light, increase ventilation, orchids like moisture, maintain appropriate air humidity, control watering and normal maintenance, and the orchid can slowly return to normal after a period of time.

1. Control watering: After the orchid leaves turn yellow, you need to wait for the soil surface to dry before watering to avoid stagnant water in the soil. 2. Apply thin fertilizer:

Orchids are not tolerant of thick fertilizers and need to apply thin liquid fertilizers every other month. 3. Suitable light: move the orchid to the scattered light to avoid it from being directly exposed by strong light, so that the yellow leaves of the orchid turn green.

The solution of orchid yellow leaves.

1. Adjust the watering

The yellow leaves of the orchid may be caused by improper watering, because it likes a moist environment, but is afraid of waterlogging, so if it is watered too much and causes water accumulation, or too little watering to dry the potting soil, it is easy to cause its leaves to turn yellow. At this time, the watering should be adjusted according to the situation, increasing the watering if it is dry, and draining and drying the roots in time if there is stagnant water.

2. Dilute fertilizer

Orchids do not need a lot of fertilizer, and too much fertilizer or heavy fertilizer can burn the rhizome of the orchid and cause its leaves to turn yellow. When this happens, the orchid should be watered the next day to dilute the fertilizer in the soil and drain it from the hole in the bottom of the pot with the excess fertilizer.

3. Adjust the lighting

Orchids have strict requirements for light, and cannot be exposed to strong direct light, nor can they lack light, otherwise the leaves will turn yellow. After the leaves are yellow, you need to adjust the light intensity and light time, early spring and winter can allow it to receive full sunlight, and the rest of the time it is placed in a well-ventilated area to receive scattered light and avoid direct sunlight.

Through our introduction, I believe you have a deeper understanding of how to make orchid yellow leaves.

Orchid yellow leaves may be caused by long-term lack of water, need to replenish water in time, if the planting soil is too compact, it is best to choose loose and breathable soil for planting, check whether the root system is rotten, prune the rotten root system, summer breeding needs to move it into a semi-shaded environment, and at the same time can not be applied thick fertilizer.

1. Moist curing

Orchid is a plant that likes a humid environment, if it is not watered for a long time in the breeding process, resulting in a shortage of water, there will be a phenomenon of yellow leaves, at this time it is necessary to water in time, but there can be no phenomenon of water accumulation, keep the soil moist, in the summer season, you also need to spray clean water, improve the humidity environment.

2. Replace the soil

At this time, it is best to replace the old soil, choose loose and breathable humus or sandy soil for cultivation, check whether the root system is rotten in the process of changing the soil, and prune in time.

3. Reduce light

Orchid is a semi-shaded plant, if it is irradiated with strong light for a long time, there will be yellow leaves, especially in summer, the light is too strong, it is best to move it into a cool and ventilated environment for maintenance, and so the leaves gradually return to normal, move it to the astigmatism place to breed.

4. Proper fertilization

If the orchid is not fertilized properly, the phenomenon of fertilizer damage will also lead to the yellowing of the leaves, do not apply fertilizer that is not rotten or has a relatively high concentration, otherwise it needs to be diluted with a large amount of water, if the soil is replaced, the root system will be cleaned with water and then re-cultivated.

1. The leaves are yellowish and grow normally: the source light is too strong.

2. The leaf color turns yellow, and the sprouts are small: excessive light, lack of nitrogen fertilizer and necessary humidity.

3. Yellowing and shedding of old leaves: caused by normal aging or repotting.

4. Rapid yellowing and falling off of old leaves: too much watering, too diligent planting, improper potting and planting.

5. The tip of the new leaf is scorched: excessive fertilization, and the planting material is not clean.

6. The new leaves and old plants are all black: the pot is too hot and humid, and there are rotten roots in the root system.

7. The sprout stops growing after it is unearthed: there are rotten roots or unclean things next to the sprouts, turn over the herbs around the sprouts, and remove the impurities to resume growth.

8. There are scorched spots on the leaves, and there is no yellow around the periphery: scorching sun burn spots.

9. Scalding and shrinking head at the end of the leaf: the water temperature for watering is too high; The temperature is too high when watering; Showers during high summer temperatures, etc.

10. Rotten hearts of new sprouts: After watering and irrigating the buds, the water evapotranspiration and absorption cannot be absorbed, and the planting materials in the pot are not clean and produce leaf rot.

11. There is water immersion around the periphery of the leaves: excessive humidity, basin humidity and air humidity are sandwiched to produce suffocation, and accompanied by leaf rot pathogens. Poor ventilation and ventilation.

12. Melasma on leaves: caused by heat on the roots.

13. There are irregular yellow spots on the leaves, and the mesophyll tissue is necrotic and depressed: caused by viral disease, also known as "Ballas".

14. Small yellow spots on the leaves: caused by beetles.

15. Purple-black on the leaves, and the back of the leaves is still green: caused by low temperature frost. Phosphate deficiency can also occur.

16. Leaf dehydration, pseudocorm crepe: caused by long-term over-drying and dehydration in the pot.

The original baiyin du of the yellow leaves of the orchid is likely to be reweeded normally, because it is now the time for germination, dao metabolism, nutrients.

The version couldn't keep up, and the old right seedlings retreated, leaving the nutrients for the new seedlings to grow. However, other reasons cannot be ruled out, such as rotten roots, soft rot and stem rot, these must be observed diligently, and they must be dealt with decisively, otherwise the whole army will be wiped out!

Go buy some fertilizer for orchids.

See if there is too much water, or poor ventilation?

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.

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.