The main causes of orchid leaf diseases and how to treat them. Photo of damaged greenery

The main causes of orchid leaf diseases and how to treat them. Photo of damaged greenery

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Often on the windowsills you can see a whole orchid greenhouse, which will impress you with its amazing flowers, various shades and the lightness of soaring petals. Orchid flowers attract attention, while leaves often recede into the background. However, we must not forget about them, because they can help predict the future of your plant. The color and shape of the leaves can help to recognize the signs of flower disease.

Why is it important for a flower to have healthy foliage?

The maintenance of the life of an orchid is impossible without leaves, since with their help the flower carries out the process of photosynthesis, absorbing light by them. The leaves are the respiratory system of the flower, if you turn them over, you can see the microscopic pores, through which the flower absorbs moisture and oxygen. Any negative influences, lack of water, light or nutrients will quickly affect its leaves.

Why does his leaves hurt?

An orchid is a capricious flower, so you need to take care of it carefully:

  • water in a timely manner;
  • monitor changes in temperature in the room in which he is located;
  • provide him with enough light.

Orchid leaves are susceptible to all negative factors and quickly begin to hurt.

Even with proper care, these tropical plants often cling to viruses, infectious diseases, insect pests and aphids.

Reasons why orchid leaves can get sick:

  • prolonged hypothermia;
  • insufficient or excessive watering;
  • lack of light;
  • sunburn;
  • overheating (steaming) of the plant;
  • viral infection;
  • insect pests.

A photo

Further in the photo you can see what the damaged foliage looks like on an orchid.

Step-by-step instructions: how to treat diseases?

Anthracnose treatment

As a result of the activity of fungi-causative agents of diseases, brown spots are formed on the leaves, strewn with small black dots.

  1. The affected areas are cut off.
  2. The remaining sections are sprinkled with crushed coal.
  3. If desired, the plants can be wiped with copper-containing preparations, for example, Topsin, Ditan, Bravo, Kaptan, Poliram.

Anthracnose appears when the environment is humid and warm and there is not enough light.

At the first signs of this disease, it is recommended to reduce the temperature and humidity, as well as provide sufficient light and ventilation.

How to deal with stains?

There are many reasons why your pet's leaves can become stained.


First, the infection is visible as yellow patches on the underside of the leaf that develop into necrotic, deeper, brown patches. Affected leaves fall off prematurely.

  1. If illness develops, avoid excessive moisture and provide air circulation.
  2. Affected leaf plates must be removed.
  3. For treatment, you can use Ditan.

Bacterial stains

Bacteria can be identified by a reddish brown or black spot. It can be tiny, like freckles, or larger, with a lighter ring around the edge.

  1. Use hydrogen peroxide to treat bacteria.
  2. Soak a cotton swab with hydrogen peroxide and blot the affected area.
  3. Never wash the back of the leaf with peroxide - it can kill the plant.

Another option is to use cinnamon paste to treat black spots on orchid leaves. Cinnamon has antibacterial properties, making it a natural choice for treating bacteria.

Moreover, it is what is at hand.

  1. Mix the cinnamon powder with water until it forms a paste.
  2. Using a cotton swab, apply the paste to the affected area.
  3. Wipe only the top side of the sheet.


Sticky orchid leaves are common. People who have no experience in growing orchids start to panic at the sight of sticky spots on the leaves. Avid gardeners know that sticky substances on plants are often secretions or "honeydew" of insect pests.

Although insect pests can cause a sticky substance on orchid plants, there is a natural sap that is produced by some orchid flowers and buds. Orchid growers call this clear, sticky substance "happy sap."

While this happy sap is produced by flowers, likely to attract pollinators, it can be in excess, causing sticky orchid leaves or stems. But it is easily washed off the surface of plants and should not be a cause for concern.

  1. If you see any sticky substance, it is best to carefully examine all plant surfaces for insects. Aphids, mealybugs can go unnoticed under leaves, at the joints of leaves and even on flowers and buds, so carefully examine each piece of the orchid's body.
  2. If you suspect your flowers have any of these pests, thoroughly rinse all parts of the plant with garden oil or rubbing alcohol.
  3. You can use horticultural oil or neem oil periodically to prevent future infestations. These oils can also prevent many fungal diseases.
  4. During treatment, it is necessary to isolate the orchid from other plants.


Deformation of orchid leaves can occur due to:

  • transplant damage;
  • hypothermia after watering;
  • due to insufficient watering.

For treatment, attention must be paid as a result of which deformation occurs.

Perhaps the plant needs to be watered more often or moved to a warmer room.

  1. If damage is done and the orchid is affected by fertilization, the path to recovery begins with decantation, removing all old medium and thoroughly rinsing the roots with water to remove accumulated salts.
  2. Then repot the orchid using fresh, clean medium and a new pot.
  3. Keep the flower in the shade and protect it from temperature extremes, as you would any newly transplanted plant, by regularly watering and re-applying diluted fertilizer.


The burn can appear from the sun or from excess fertilizer. A strong fertilizer can burn not only the roots, but also the leaves of the orchid. Many gardeners recommend watering the plants with water and then watering them a second time with the fertilizer solution. This ensures that the medium is thoroughly moisturized before fertilizing.

Some mixtures containing pine bark can be difficult to wet, so they should be pre-moistened with water and left for a few minutes until the environment becomes moist. This helps reduce salt build-up and burns.

If a burn appeared from the sun, most likely direct sunlight falls on the leaves, then it is necessary:

  1. transfer the flower to a poorly lit place;
  2. carefully cut off the damaged sheets, not forgetting to sprinkle the remaining wounds with soot;
  3. increase watering;
  4. cancel all fertilizers during treatment.

Powdery mildew

This disease is evidenced by a white coating on the leaves and flower buds.

A common cause of the disease is the "greenhouse effect".

If you notice signs of this disease in an orchid, you urgently need to adjust the humidity level in the room and start treatment:

  1. treat the plant with a solution of colloidal sulfur;
  2. for prevention, you can spray with Fitosporin.


With this disease, plants noticeably lag behind in growth. On the underside of the leaves, raised spots are formed, covered with a powdery orange bloom.

  1. A diseased flower must be isolated immediately.
  2. Damaged sheets are destroyed.
  3. After removal, the remaining mechanical damage is treated with brilliant green or a weak iodine solution.
  4. The remaining greens are washed under running water and wiped dry with a damp cloth.
  5. For treatment, you can use fungicidal drugs.

Sooty fungus

This disease develops on the leaves of orchids, which turn black due to pests (aphids, mealybugs, white scale insects).

In this situation, it is necessary:

  1. isolate the flower from other plants;
  2. rub the black spots on the leaves with Mikosan.
  3. reduce watering.

General preventive measures

  1. Buy healthy plants. Inspect the leaves for reddish brown or black spots before purchasing. Don't buy plants with spotted leaves.
  2. Provide air circulation. Orchids love moisture, but bacteria love it too.
  3. Avoid overflow. Besides killing the roots of your orchid, standing water is like inviting unwanted bacteria to settle in your orchids. Learn how to water properly and you will avoid the root causes of orchid death.
  4. Insulation. As an extra precaution, isolate the new plant for a week or two to make sure it doesn't bring in new viruses. Sometimes we can overlook bacterial stains, which somehow become glaringly obvious once at home. If you notice something unusual, the first step is to identify the problem so you can apply the correct treatment.
  5. If your orchid has a leaf that looks bad, cut it off. Pruning the affected area with a pair of sterilized scissors is another option. To sterilize the scissors, wipe them with a cotton swab dipped in alcohol. When making a cut, trim about 1 cm past the black spot. If the entire leaf is affected, cut off the entire leaf at the base.

Noticing in time that the leaves are covered with spots, have lost their elasticity or have changed color, you can quickly help your orchid and avoid the sad consequences. With proper care, orchid leaves will delight the eye with their greenery. And the flower will live a long life, filling your home with comfort and beauty.

We offer you to watch a video about orchid diseases:

Watch the video: Why Are My Orchid Leaves Splitting? And How To Prevent It (August 2022).