What s going on with the orchid leaves covered with small black spots

Hello. Is it damp and unventilated? Or sun exposure can cause dark spots on the leaves.

Orchids prefer a moist, shady, cool and ventilated environment, and if the place is not ventilated, it is easy to grow mold.

Orchid is a kind of plant that "looks at the leaves better than the flowers". When an orchid is infected with black spot disease, the best way is to remove its diseased leaves, but this will reduce the ornamental and economic value of orchids (especially precious species). The following three methods can be effective** orchid black spot disease and do not need to remove the diseased leaves.

1. Gentian purple method After finding that the orchid suffers from black spot disease, it should be immediately wiped with gentian purple (the coating area slightly exceeds the lesion), the plaque will no longer expand, and it can be healed within a few days, so that the leaves can be preserved, and it is equally effective if the saturated solution of potassium permanganate is not used without gentian violet.

2. Spraying edible vinegar on the foliage of flowers can eliminate black spot, powdery mildew, and leaf spot, and can also prevent and control the yellowing of camellia and rhododendron.

3. Leek method Soak the leek leaves in clean water for 24 hours, generally the ratio of leeks to water is 1:10. Watering the flowers with water soaked in leeks can prevent black spot and powdery mildew, and can reduce the disease on infected flowers.

Spraying the leaves of diseased flowers with water from soaked leeks can also be a symptom.

Black spot disease, also known as anthracnose, is the same type of orchid disease as leaf spot, round spot and so on. I believe that the main cause of this disease is that the temperature is too high and the planting material is too wet, and the new grass that grows quickly is the most susceptible to this disease, and the late summer and the whole autumn are the high incidence period of black spot disease. Lan friends must be careful during this period, observe more, and prevent and treat the disease as soon as it is discovered.

Prevention should be given to the prevention of melanoma, which is usually taken every 10 days or half a month, and once a week during the high incidence season.

The best method of black spot disease, according to my experience: after the disease is found, immediately control the water to the white surface of the basin, use carbendazim or tobuzin, add water in proportion to the treatment every 3 days, generally 3---5 times after the effect will be effective, if the observation for 10---15 days, it is found that the black spot in the orchid leaves does not spread or does not change, it means that the prevention and control has been successful! In the future, just carry out normal prevention.

For those with small black spots on diseased leaves, just let her do it, and if the black spots are large, just cut off the diseased leaves.

What's the deal with small black spots on orchid leaves.

Summary. The orchid leaves have black spots on the back and none on the front, because they are infected with anthrax. Anthrax is a fungal-induced disease, which generally occurs in the high temperature season, especially when it is sunny and rainy, the cultivation density is large, the planting material is too fine, and it cannot be ventilated.

There are black spots on the back of the orchid leaf, but not on the front, what's going on?

The orchid leaves have black spots on the back and none on the front, because they are infected with anthrax. Anthrax is a fungal-induced disease, which generally occurs in the high temperature season, especially when it is sunny and rainy, the cultivation density is large, the planting material is too fine, and it cannot be ventilated.

For orchid anthracnose, we should focus on prevention, pay attention to the use of coarse-grained planting materials, reasonable watering, fertilization, ventilation, frequent spraying of chlorothalonil, charcoal special clear and other drugs, prevention before it happens. 1.When the disease is mild, the diseased leaves can be treated in case of disease, and the diseased plants can be isolated from other orchids.

If the disease is mild and there are fewer disease spots, the diseased leaves can be cut off to avoid infection. The diseased leaves that are cut off must be burned in time to avoid infection. Don't be reluctant, otherwise the whole plant will be infected and you will regret it.

After cutting off the diseased leaves, spray the drug in time, the special effect on anthrax is 50 anthrax powder, once every seven days, 3 times in a row, the control effect is more than 90, generally can effectively control the harm of the disease, can control the lesions no longer expand, and kill the disease bacteria.

2.When the disease is severe, you can consider changing the pot When the disease is serious, if it is a precious variety, you can consider changing the pot, take out the diseased plant from the orchid pot, cut off the diseased roots, diseased leaves, put it in potassium permanganate solution for disinfection, soak for a period of time, dry the roots into chalky white, change the planting material again, and change the pot. After watering, slow the seedlings.

After changing the pot, continue to spray the anti-disease drug, once a week, three times in a row, generally it's okay!

First, the temperature is too low.

1.Cause: If left in too cold for a long time, the leaves of the orchid may get frostbitten and then develop black spots. 2.Solution: Transfer to an environment over 15 and give it some soft sunlight. It recovered after a while.

Second, the occurrence of diseases.

1.Why: It's exquisite.

If the maintenance environment is poor, it may be infected by some germs and cause diseases. This can also lead to the appearance of dark spots on its leaves. 2.

Treatment: Put it in a well-ventilated place and cut off all the diseased leaves with scissors. After that, spray the fungicide cavity every 3-5 days until it heals.

3. Overwatering.

1.Causes: In an excessively humid and flooded environment, its root system may be flooded with water, resulting in poor growth and black spots on the leaves. 2.Treatment: Take out the pot from it, cut off the black roots, and plant it in the new flower soil for maintenance.

The appearance of black spots on the leaves of orchids should be anthracnose.

1. Orchid anthracnose, also known as black spot and brown spot, is caused by orchid anthracnose, which mainly harms the leaves and stems, and is a common heavy and scattered wild disease of orchids.

2. The disease is harmful to orchid leaves, often occurring at the tips and edges of orchid leaves. The leaves are diseased, the initial stage is round or oval, black stool called color spots, and then gradually expanded, the later lesions ** are light brown or dark brown or dark brown on the edge, and the boundary between the disease and the healthy part is clear.

3. Pharmaceutical prevention and control: spray 800-1000 times of Pyrobium shark liquid, 500 times of 50% anthrax Fumei wettable powder, or 2000 times of 30% Tefulin wettable powder, spray once every 10 days, 3 to 4 times in a row, and control the disease with rough advice.

1. The temperature is too low.

If it is exposed to too cold for a long time, the leaves of the orchid may suffer frostbite and develop dark spots.

2. Disease occurs.

It is relatively delicate, and if the maintenance environment is poor, it may be infected by some germs and cause diseases. This can also cause dark spots to appear on its leaves.

3. Overwatering.

In an excessively wet environment, its root system may become waterlogged, causing it to grow poorly and causing black spots to appear on its leaves.

Small black spots appear on the orchid plant, and the wax base may be suffering from orchid black spot disease, leaf spot, black spot, etc., or it may be attacked by insect pests, such as red spiders, aphids, etc. For pests and diseases, in addition to using the corresponding pesticides to sterilize, insects and mites are removed, it is also necessary to do a good job in the follow-up process of raising this pure protection, and the forest bureau is instructed to avoid black spots again.