Orchids, why are the leaves black Orchid leaves turn black from the roots and dry out?

If it is a black leaf spot, it may be caused by bacteria, first subtract the leaves with germs, do not cause secondary pollution, and the diseased leaves should be treated. You can use some sterilization medicine again, once every 10 days, and it will slowly take effect! For example, Tuobujin, chlorothalonil 、、、

Reasons why the tips of orchid leaves are black:

1. Watering too much or too little:

Orchids prefer humid climates and especially prefer higher air humidity. If the long-term watering is insufficient 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 black leaves or leaf tips. 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 not placed in the right place, too much or insufficient light, can also cause scorching tips or leaf edges.

3. Excessive fertilization:

Orchids should be lightly fertilized, not thick or raw. If the fertilizer is too concentrated at one time, especially the application of excessive chemical fertilizer, it will often cause root damage and then cause anxiety.

4. Pest and disease hazards:

Orchid plants are attacked by diseases and insects, which will also cause the orchid plant to hurt the leaves and roots, and eventually the yellow leaves and scorched tips will appear.

The pH of the culture soil is not suitable (the soil is alkaline), the long-term non-fertilization or unpotting soil and environmental pollution are easy to cause yellowing and yellowing of orchid leaves or scorching of leaf edges.

Prevention and control methods for blackening of orchid leaf tips:

1. The soil should be appropriate

Choose slightly acidic, loose and fertile culture soil, and pay attention to changing pots and soil in a timely manner, and regularly apply ferrous sulfate solution to keep the potting soil slightly acidic.

2. Watering should be scientific:

It is necessary to decide whether to water and how much water according to the season, growth and development stage and the dryness and wetness of the potting soil, etc., especially pay attention to increasing the air humidity and avoid over-drying or long-term over-wet water accumulation of the potting soil.

3. Fertilization should be reasonable

It is necessary to apply thin fertilizer skillfully, and avoid applying thick fertilizer and unrotted liquid fertilizer. The next morning after fertilization, water should be poured once to dilute the fertilizer and avoid the occurrence of fertilizer damage.

4. The light should be suitable

Orchids like semi-shade, in addition to early spring and winter to see more sunlight, people should take shade measures in time after summer, avoid strong direct light, it is best to put under the shade or in the shade of the building to maintain.

5. Timely prevention and control of pests and diseases

It is necessary to prevent diseases and eliminate insect pests as soon as possible, and pay special attention to the prevention and control of anthracnose, black rot, scale insects, etc.

The leaves of the orchid begin to turn black and dry from the roots, which is due to the infection of stem rot, which first causes the false bulb and root system of the orchid to be damaged and blackened and rotted, and then gradually spreads upwards to the leaves, causing the leaves to also turn black and die and fall off.

At this time, the orchid plants were basically hopeless. Therefore, in daily management, we must grasp the supply of water, fertilizer, ventilation, etc., and do a good job of prevention, not to take it lightly. When symptoms appear, there is no way back.

The black leaves of orchids do not affect the flowers that bloom.

The main reasons for the black leaves are:

First, the light is too strong.

Orchids are semi-negative plants and are inherently afraid of the sun. If it is maintained under strong light during the management period, especially in the scorching sun in summer, it is easy to sunburn the plant, and the leaves will turn black and yellow. In this case, the black leaves should be cut off as soon as possible, and then moved to a ventilated semi-shaded place, sprinkled with appropriate amount of water to help the plant cool down, and slowly recover.

2. Infection with diseases.

If the environment is not suitable for daily use, it is easy to be infected with diseases, and once the infection is not treated in time, the leaves will have black spots, which will slowly expand, and the whole leaf will turn black. It is necessary to find out the specific infection disease as soon as possible and spray it for treatment. In addition, the brothers also had to change the maintenance methods to provide a conducive environment for growth, so that the plants could recover.

3. Overwatering.

Orchids are not resistant to waterlogging and lead. If you water too often, the soil will be waterlogged, and the roots will rot after a long time, and the leaves will be easy to turn black and yellow. In this case, the plant should be depotted as soon as possible, the rotten roots and black leaves should be cut off, and the seeds should be replanted after disinfection.

Fourth, improper fertilization.

It needs nutrients during the growth period and should be fertilized scientifically. If the concentration of fertilizer applied will burn the roots, the leaves will also be easy to blacken. To change the fertilization method, apply a low concentration of fertilizer. In addition, if the situation is serious, it is necessary to remove pots, prune roots, change soil, and re-manage.

The blackening of orchid leaves may be caused by over-watering, which should be reduced immediately, and after the soil is dry, it should be carried out in accordance with the principle of seeing dry and wet, and watering thoroughly at one time; If it is due to insufficient light, the orchid should be moved to a place with astigmatism for maintenance; If it is due to excessive spraying, you can wipe its branches and leaves with a moistened cotton cloth.

1. Watering too often

Many people find that orchid leaves turn black when maintaining orchids, which may be caused by overwatering, should immediately reduce watering, move the potted plants to a ventilated and dry place, wait for the soil to become drier, and then carry out normal maintenance, usually watering can be carried out in accordance with the principle of seeing dry and wet, watering thoroughly, and the amount of watering should be controlled in winter.

2. Insufficient light

When breeding orchids, it should not be placed in a cool place for a long time for maintenance, which will seriously affect the growth of orchids, resulting in its leaves yellowing and blackening, the orchid should be moved to a place with astigmatism for maintenance, to ensure that there is sufficient light, can make it grow luxuriant, more ornamental.

3. Excessive spraying

If it is to prevent pests and diseases and excessive spraying will cause the leaves of the orchid to turn black, it should be wiped with a moist cotton cloth on its branches and leaves, it is best to change the soil and plant, spraying pesticides to prevent pests and diseases should be sprayed once every 10 days or so, and continuous spraying 2 3 times can achieve the effect of control.

4. Excessive fertilization

Orchid peanut needs to be applied an appropriate amount of fertilizer for a long time, which will help it grow, but too heavy fertilization will cause it to produce fertilizer damage, at this time, the rhizome of the plant should be rinsed with water, the fertilizer is diluted, and then planted in the new potting soil for maintenance, and the fertilizer can be applied after three months.

1. Dry air: If the orchid is in a dry environment, the leaf moisture imbalance is easy to blacken, so it is necessary to spray water frequently to increase humidity. 2. Watering too much:

If you water it too much, it is easy to soak the roots and cause the leaves to turn black, so you need to stop the water as soon as possible and strengthen ventilation to evaporate the water. 3. Improper fertilization: If the fertilizer with high concentration is applied, it will cause fertilizer damage, and it needs to be rinsed off with water as soon as possible.

4. Infected with diseases: Once the infected leaves are easy to turn black, prune the diseased leaves as soon as possible and spray fungicides.