The leaves of the orchid are a little black, what should I do?

The causes of dark spots on orchid leaves are complex and cannot be explained by a single disease or phenomenon. However, Lan You's medication treatment without knowing the details often does not have much effect. I have collected some cases of black spots on orchid leaves, and the causes of these dark spots on orchid leaves have been tracked, so they are more real, and you may wish to refer to them again.

If you look closely enough, you will find that the dark spots on orchid leaves are most likely to appear in a certain season, which season is it? Generally from the end of flowering at the end of February to the end of spring in mid to late May, this is the time when dark spots on orchid leaves are most likely to appear. Why?

Let's take a look at a few different types of orchid spots. 1. The back waves push the front waves As the saying goes: the back waves of the Yangtze River push the front waves, and the front waves die on the beach.

The leaves of orchids are updated and iterated every year, so when the old leaves reach a certain age, it is normal for them to appear yellow, black and scorched because of physiological aging. So since it's an update iteration, why do you have to choose spring? Maybe you have some evergreen trees in your neighborhood that don't lose their leaves in the fall, but once the new shoots start to sprout in the spring, the old leaves start to wither and fall off.

The same is true for orchids, after flowering in spring, it is the budding period, and the old seedlings are slowly pushed down at this time, appearing yellow and retiring. This is physiological and is also a natural law, especially for large clusters of orchids with many orchids, there are usually a few seedlings of old leaves after flowering. There is no way to treat it, and when such dark spots or spots appear, timely pruning is the only way.

2. Anthrax Orchid anthracnose bacteria can survive in the soil for many years, and there are more cooked soil in the countryside than humus in the mountains. The lesions of anthrax are very distinct, and those that occur from the tip of the leaf will have a clear dividing line. As the name suggests, anthrax has a charcoal-like color at the lesions, and the lesion dividers are easily broken.

Simply pruning the diseased leaves will not stop the germs because pathogens like ** have invaded the lower orchid leaves. **Orchid anthracnose is best treated with a highly systemic drug, such as methyl tobuzin. Orchids found to have anthrax must cut off the diseased leaves and destroy them far away from the park, of course, the best way is to destroy them by fire, because the anthrax virus will still survive under the soil after landfilling.

The cut of the pruned orchid plant can be coated with methyl tobuzine mud, and chlorothalonil can be sprayed with external pathogicide. Generally, one week is a cycle, and three consecutive cycles of pesticide application can control the spread of the disease.

3. Insect bite spots A few days ago, an orchid friend uploaded a **, the orchid leaves look good, but irregular translucent dots appear on the leaves. He didn't understand what kind of disease it was, but it was actually caused by insect bites, especially spider mites, which were too small to be detected. These translucent spots do not have a big impact on the leaves at first, but over time, the translucent dots on the leaves that have been bitten by pests will slowly turn into black spots until the entire leaf is densely packed with black spots.

Orchids are elegant and beautiful, and the main reasons for the blackening of the leaves are due to improper watering, excessive fertilization, too low air humidity, infection with germs, etc., so it is necessary to check the causes caused by specific signs and carry out symptomatic conditioning. When cultivating orchids, watering and fertilizing should be appropriate. In addition, it is necessary to control the temperature and prevent the occurrence of bacterial infection.

1.Watering. Orchids are plants that like moisture and have high requirements for the soil.

In order to keep the soil moist, watering must be in moderation, if the watering is insufficient and the soil is too dry, it will cause damage to the root system of the orchid, which will cause dry leaf tips and black leaves. In addition, if you water too much, it will cause stagnant water, which will cause damage to the root system and leaf tips of the orchid, causing the leaves to turn black. So be sure to pay attention to proper watering to promote its healthy growth.

2.Excessive fertilization.

In the process of orchid breeding, we must pay attention to fertilization on time, if too much fertilization, it will make its roots unable to absorb too much nutrients, and the leaves will be dry and sharp, black. Therefore, it is necessary to pay attention to the fact that when the leaves are blackened, the amount of fertilizer should be reduced, and the orchids can be better cultivated according to the principle of thin fertilizer and frequent application.

3.The air humidity is too low.

Another reason why orchid leaves turn black is because of the low humidity of the air, especially in winter, when the tips of the leaves of orchids turn black. This is caused by the imbalance of moisture in the orchid leaves due to insufficient air humidity.

4.Infection with germs.

Infection with germs can also cause the leaves of orchids to turn black, so we must pay attention to disease prevention and control when breeding. If the leaves are blackened due to infection and are not controlled in time, it will affect the healthy growth of orchids.

It can be seen from the picture that the tip of the orchid leaf has turned black, so what is going on?

1. Natural factors.

2. Improper maintenance management.

Improper management in the daily maintenance process of orchids can also lead to blackening of orchid leaf tips, which are commonly caused by too strong light, insufficient light, too much watering, too little watering, excessive fertilization, and too concentrated spraying, all of which are artificially controllable. Orchids are maintained in semi-shaded or shaded and well-lit places, and thin fertilizer is applied frequently, and trim microbial agents can be used, which has mild fertilizer effect and does not hurt the roots, and Yilan bacteria form a protective barrier around the orchid roots, which can reduce pests and diseases.

3. Diseases. Orchid strains are attacked by pathogens will also cause the tip of the orchid leaves to blacken, common brown spot, anthracnose, black spot, leaf blight, blight, the above five common diseases generally do not appear single, many times there will be a variety of symptoms at the same time or alternately, it is difficult to prevent and control, it is best to prevent, try to avoid the occurrence of these diseases. First of all, when potting, the planting material and orchid plants should be disinfected, and the ventilation should be strengthened in the maintenance process, and the fertilization should be balanced, and the nitrogen fertilizer should not be biased, and poor ventilation and partial nitrogen fertilizer will be conducive to the occurrence of diseases.

Black spots on orchid leaves are a manifestation of the virus infection in orchids, indicating that the virus invades the orchid's body, and if flower lovers do not pay attention to controlling the spread, it will affect the growth of orchids. Black spots mostly appear in summer and autumn when there is high temperature, rain, stuffiness and little wind.

Some orchids have black spots in the center of their leaves, and some have black spots on the edges of their leaves. The dark spot starts as a small spot at the tip of a needle, but it will slowly expand into a distinct round black spot, blocking the delivery of nutrients from the orchid. The upper part of the leaf slowly withers, and the lower part accelerates aging.

After the appearance of dark spots, flower friends need to master 3 tips and skills to prevent well:

1. Before the arrival of the high temperature and rainy season every year, spray carbendazim once or twice on orchids; Usually pay attention to put orchids in a ventilated place to allow air circulation in the orchid place.

2. Pay attention to the changes in orchid leaves, and find that the black spots on the orchid leaves should be isolated in time, and the black spots should be smeared with aloe vera juice or canker liquid.

3. After discovering that there are black spots on the leaves of the orchid, you must not stop watering the orchid to keep the potting soil dry.

The blackening of orchid leaves may be caused by the air being too dry, the moisture imbalance of orchid leaves, which is common in winter, can be sprayed to increase air humidity and prevent orchid leaves from blackening, and at the same time pay attention to avoiding rain, in the high temperature and rainy season, the pot should be placed in semi-shade and will not be drenched by rain.

It may also be the blackening of orchid leaves caused by improper water and fertilizer control, and the usual watering follows the principle of seeing dry and wet, so that the soil is in a slightly wear-resistant and moist state. If the potting soil is too little watered, it is necessary to soak the potting soil in time, and if the potting soil is seriously waterlogged, it is necessary to re-potting the plant. The fertilization method of thin fertilizer and frequent application is adopted, and the diluted fertilizer needs to be watered with water if the fertilizer is too much, and the top dressing should be applied when the nutrients are lacking.

It may also be the blackening of orchid leaves caused by bacterial infection, such as brown spot, anthracnose, black spot, leaf blight and blight. The leaves that have been infected with the disease need to be cut off in time, if the leaves are partially cut, the normal leaf color part needs to be cut by 1 cm more to prevent re-lesions, which is called the source of disease.

Growth habits of orchids

Orchids prefer semi-shaded and warm and humid environments, and must be moved indoors for wintering in central China. Orchids are mostly wild in the valley under the sparse forest, containing humus-rich, well-aerated and water-permeable slightly acidic soils. The roots are 50-80 cm long and are distributed in the topsoil.

It grows most luxuriantly in the semi-shade under the tree, but not as much as the plants in the dry place with more sunlight and slightly yellow leaves, and requires full sunlight in winter.

The root system of the orchid needs to be symbiotic with the orchid fungus, otherwise the growth will be poor and the seeds will not germinate. Do not fertilize in early spring when the temperature is below 15 degrees, and when the temperature rises to 18 degrees Celsius and 25 degrees, you can apply fertilizer in an all-round way. Do not fertilize orchids when they are not potted, do not fertilize weak seedlings, and do not fertilize orchids if their roots are not strong.

1. Adjust the temperature reason: the orchid is not cold-tolerant, if it is invaded by the low-temperature burning ruler, its roots and branches will stop working, and the tips of the leaves will turn black. Workaround:

In winter, it should be moved to a warm leather stove to warm the sleepy place to avoid frostbite from low temperatures. Don't rush to move out in the spring, because the temperature is unstable in early spring, and there are often cold snaps, so when the temperature is completely stable, move it outside.

2. Proper shading reason: it does not like strong light, if it is directly irradiated by a strong sun, there will be a phenomenon of blackening of the leaf tip. Workaround:

It needs to be exposed to astigmatism, and it needs to be properly shaded at noon when the sun is heavy. In winter, the daylight is relatively short, and the sun is not strong, so there is no need for shade, so it can receive all-day sunshine.

3. Reasonable watering reasons: orchids are not waterlogged, and too much watering is easy to make the potting soil waterlogged, which will affect its root respiration, and the leaf tips will be black. Solution: Watering should not be too much, once a day when the temperature is high, and once every two days when the temperature is low.

4. Reasons for reducing fertilization: orchids do not like thick fertilizer, which is easy to burn roots, and if there are health problems, the leaf tips will turn black. Workaround:

Fertilization should be applied with light fertilizer, and the fertilizer should be about ten centimeters away from the roots, so that the roots will not be burned. When watering, pour water on the fertilizer so that the water spreads out with the fertilizer so that it can absorb it.

There are two ways to cause dark spots on the edges of orchid leaves: The cultivation soil does not meet the requirements for orchid growth. Too much watering.

I didn't do a good job of avoiding the sun and increasing humidity. Yes, in addition to the unglazed clay pot (also known as the tile pot) that pays attention to the permeability and ventilation of the flower pot, the cultivation soil formula should be 80% rotten leaf decay bark + 20 clay particles (red brick crushed grains can be used), if the cultivation soil quality is not right, please change the pot immediately, and prune the rotten roots (the wound is dipped in charcoal powder for disinfection). Yes, orchids like humid air environment, but they are very afraid of waterlogging can not be watered every day, to strictly do "not dry and watering is watered thoroughly", generally a week to ten days watering (midsummer).

Yes, orchids like light and fear of the sun, only need to scatter light, to avoid direct sunlight, in the climate of high temperature and dry days to often spray the foliar dust and humidification (not a large amount of into the potting soil). On the issue of fertilization: orchids are suitable for applying light slightly acidic farm fertilizer (families can use rice water, noodle soup, fish intestines, etc. to fully rot and make it) and apply it once a month instead of water.

Apply chemical fertilizer during the growing period, and evenly apply 10-20 grains every two months under the soil at the edge of the pot. Carefully control and do a good job in the above aspects, the orchid will not have black leaves (except for the old leaves of the previous year), and it will grow healthily.

Solution to the tip of the orchid leaf to dry up and turn black:

1. The placement of flowers should be ventilated and overcome direct sunlight. Orchids often have leaf tips dry up, and even whole leaves withered, the first orchid flower friends do not know what to do, orchid leaf tips dry is mainly due to orchid anthracnose and round spot disease, orchids suffer from frost damage or late frost damage, but also easy to form leaf tips dry or discolored, let's look at the specific solutions.

2. When orchids suffer from frost damage or late frost, they are also prone to dry up or discoloration of leaf tips. Therefore, in areas where the temperature is below 0 in winter, the orchids should be moved indoors for ventilation and maintenance in a sunny place before winter. When moving outside in spring, take care to avoid the damage of late frost.

The traditional spring is not windy, summer is not dry, autumn is not dry, and winter is not wet, which is very good for preventing the orchid leaves from drying out.