Why do the leaves of Cymbidium turn black and die?

Generally speaking, the leaf color of Cymbidium is white and pale, which is due to strong sun exposure; the leaf color is yellow and withered because of insufficient nutrients or long-term drying of basin soil; the leaves turn black and fall off because of too much watering and too much fertilization. The methods of prevention are:

① every year before Ching Ming Festival to turn the basin to change soil, replenish nutrients, in time to remove eroded blackened roots. After changing the basin, the roots must be damaged, coupled with the low temperature, slow water evaporation, weak absorption capacity, management to keep the basin soil moist, do not rush to fertilize, otherwise it will cause leaves yellowing and falling off.

During the growing season, ② is watered with rotten and thin liquid fertilizer every lo~15 days or so.

③ grows well when the temperature is 20 ℃ ~ 25 ℃. Hanging orchid is particularly sensitive to light, requiring a semi-overcast environment, so it is better to be semi-overcast in spring and autumn, and to see light in the morning and evening in summer, and to be placed in a shady place at noon. The room temperature should be kept above 4 ℃ ~ 5 ℃ in winter. If the temperature is too low, it will suffer frost damage.

④ should keep the basin soil moist in the growing season, except that it does not require much water in dormancy in winter. When it is extremely hot in summer, water is often sprayed around flowerpots and leaves to cool down, creating a cool and humid microclimate.

⑤ often clears the dead leaves along the edge, prunes the leaves, sprays the leaves, removes dust and pays attention to the harm of soot.

If the phenomenon of leaf black branch blight has occurred in ⑥, the orchid should be poured out of the basin in time, the soil should be washed, the shrunken roots should be cut off, and then put on the pot with new soil after drying. Pour enough water into the basin, keep it moist in a cool place, transfer to normal management after half a month, and still thrive.

What to do when the pest grows? pest control / prevention is very important.

Although the hanging orchid is good-looking and ornamental, what if the occurrence of diseases and insect pests not only affects the beauty, but also leads to the death of the hanging orchid? How should we deal with the disease? The editor gives you a detailed method of pest prevention and control of hanging orchids.

What if the orchid grows worms?

After research, it is found that the pests that often appear on the branches and leaves of Cymbidium are mainly shell insects, nematodes, aphids and whitefly. The symptoms and methods are as follows.

1. Scale insects

Symptoms: yellow leaves, poor plant growth, shedding, growing and dying, yellowish-brown or purplish-brown shells on the leaves, and white, transparent and sticky honey secreted by scale insects.

Control method: cut off the branches and leaves of the long worm, and then spray the medicine according to the number of worms. It can be sprayed with 40% omethoate diluted into 1000 times solution, or 50% malathion diluted into 1500 solution.

2. Nematodes

Symptoms: slow growth of the plant, yellowing of leaves, and finally death of the whole plant.

Prevention and control method: if this kind of situation hanging orchid grows how to do? 15 grams of carbofuran granules with a concentration of 3% can be evenly applied on the way, then covered with 10 cm thick soil, and then watered thoroughly, which can generally remove a variety of pests.

3. Aphids

Symptoms: the plant is malnourished and the leaves are yellow. if there are many aphids, honeydew will be secreted to cover the leaf surface of the orchid.

Prevention and control methods: use 40% of the concentration of imidophos diluted into 1000 times solution spray generally 7-10 days once, continuous spraying 2-3 times can relieve the harm.

4. Whitefly

Symptoms: the leaves are withered and yellow, the wounds on the leaves will rot, and in severe cases, the whole plant will die.

Prevention and treatment: spray with 40% omethoate diluted into 1000 times solution, or spray with 80% dichlorvos EC diluted to 1000 times solution.

Prevention and control of diseases and insect pests of Cymbidium

1. Leaf blight

Symptoms: the leaves turn yellow first, then brown spots, which extend to the base of the leaves until the whole leaf turns brown or grayish brown, and black dots appear on the back of the leaves.

Etiology: higher ambient temperature, more humidity and poor ventilation.

Control methods: control soil moisture, increase organic fertilizers such as phosphate fertilizer and potassium fertilizer, improve the ventilation of the environment, spray with a solution diluted to 600 times with 70% mancozeb, once every 15-20 days, 2-3.

2. White silk disease

Symptoms: purple-brown spots on the leaves, followed by a distinct white mycelium, the plant withered and eventually died.

Causes: high temperature and humidity of environment, stagnant water in soil, poor ventilation and light transmission.

Prevention and control methods: watering should be appropriate, fertilization should be reasonable, specific reference can be made to how to water the orchid. Do not plant too deep, when the disease can be sprinkled with lime powder, once every 15 days, 2-3 times.

3. Stem rot

Symptoms: the disease begins from the old seedling, after the disease, the base of the stem will turn brown, the leaves lose green and begin to droop, and then grow upward until the whole plant dies.

Causes: moist soil, lack of light, poor ventilation.

Prevention and control methods: control soil water and fertilizer, so that the soil is not too wet, give the orchid a certain amount of light and ventilation, which is the basic knowledge of pest control. During the onset of the disease, the powder with a concentration of 77% was diluted to 1000 times the solution and sprayed.

4. Anthrax

Symptoms: the leaves appear yellowish-brown and sunken spots, then expand called dark brown round spots, the leaf tip withered, and then the whole plant dies.

Causes: high humidity and muggy environment, stagnant water in flowerpots, overdense plants and poor ventilation.

Prevention and control methods: control the watering times to avoid too much soil moisture, when the disease with a concentration of 75% chlorothalonil diluted to 1000 times the solution for spraying.

5. Root rot

Symptoms: often appear on the seedlings, the symptoms are not obvious in the early stage, but the root rot increases significantly in the later stage, which leads to the yellowing and wilting of the leaves, and then returns to normal at night.

Causes: lack of light, soil stickiness is easy to harden, and germs invade the soil.

Prevention and treatment: the soil and seeds can be disinfected before planting, and 50% carbendazim is sprinkled on the way during planting, and when the disease occurs, it can be irrigated with 40% root rot ning, once a week.

The ten kinds of foliage plants that are most suitable for indoor cultivation, hydroponics and soil culture can be selected by you!

It is becoming more and more common for families to grow flowers. Many flower lovers grow flowers just to make their homes a little more green and a little more green. As for keeping them well and exquisite, it takes too much time.

The editor recommends to you that most of the ten kinds of plants that are most suitable for domestic cultivation can be hydroponically cultivated. Isn't that very sweet?

1. Green apple

Green pineapple must be recommended by the editor, and it is also familiar to everyone. Basically, there can be no green plants in the office, there must be a pot of green pineapple!

Green Luo likes Yin, it is enough to give light once a week, and completely indoor scattered light will not hang up.

No water to add water, no need to change water, this is the legendary cheap breeding!

2. Hanging orchid

Hanging orchids, leaves and roots, will also blossom!

Hydroponic culture is more beautiful, soil culture is easy to burst!

But the orchid needs light, without the light, the orchid fades to green, becomes yellow and white, and is fragile.

3. Copper grass

The copper grass is similar to the hanging orchid, and it also needs light. Without the light, the pole is thin and tall, and it is easy to fall down.

The copper grass container has been selected, but it is very beautiful!

4. Rich bamboo

The name of Fugui bamboo is good, the meaning is good!

It is also easy to raise. Just insert a glass bottle and change the water frequently.

Green plants need light, and rich bamboos are no exception.

There is a recipe for rich bamboos: throwing two rusty nails in a glass bottle can make rich bamboos green and beautiful. You can try.

5. Ivy

Ivy is a very common climbing plant, the whole piece under the viaduct!

If you have a wall at home, you can go home and plant an ivy.

Hydroponic planting of two ivy is also a unique flavor.

6. Dryopteris przewalskii

Dryopteris is very good-looking in foliage plants, with thin black poles like wire and green leaves like small fans. It is really beautiful to put them on the desk.

Dryopteris likes water, often grows on the edge of streams, likes bright scattered light, avoids direct sunlight, and is just right to be raised indoors.

This is the end of plants that can be cultivated in both hydroponics and soil. Let's introduce several kinds of green plants cultivated in soil.

7. Fortune tree

The rich tree is a very common plant on the computer desk, but there is something wrong with the rich tree. We must pay attention to it:

Rich trees that have been indoors for a long time should not easily move outside to bask in the sun. Rich trees are particularly sensitive to light!

Some friends bask in the sun to the rich tree on a whim, and then the leaves turn yellow, become transparent and die.

8. Money Tree

The leaves of the money tree are like a long string of copper coins, implying the attraction of wealth, splendor and wealth!

The money tree is also easy to raise. If you pour water and put it on the table, you will have new buds if you don't have to take care of anything.

Yitou is also very good, friends who need to give gifts might as well consider giving money trees, which are easy to raise and beautiful, and have a good intention!

9. Dishui Guanyin

Dishui Guanyin blossoms really like Guanyin. You must try to raise your own flowers when you have a chance.

The editor has a big dripping Guanyin, which froze to death at the beginning of the year and cut all the leaves. Now it not only grows back, but also blossoms!

Dripping Guanyin refers to the dripping of its juice from the tip of the leaf, and this juice is a little toxic!

Flower friends who have children at home should not raise them.

10. Asparagus

Asparagus gives people a kind of vulgar and elegant, literati temperament, placed in the living room is very temperamental!

But asparagus is a little more difficult to raise than the plants introduced above.

Asparagus leaves are easily yellowed, light and water are indispensable!

The reason why we put asparagus at the end is to let our friends raise it slowly. Do you have the feeling of upgrading and fighting strange?