Black and white spots on an orchid
Spots on the leaves of the orchid appear when the flowers are diseased and indicate that the plant needs special care. The choice of method and means for treatment depends on the color of the spots. Timeliness and the right choice guarantee the preservation of life of the phalaenopsis, which subsequently will please with lush flowering.
Black and white spots on an orchid
Types and characteristics of diseases
The spots on the phalaenopsis flowers are dark and light. There are such colors of defeat:
- black spots on the leaves of orchids;
- brown (brown) stripes and dots on the crown and trunk;
- white spots on the leaves of orchids.
Black spots that appeared on orchid flowers stand out as a separate group of signs of the disease.
Infection is characterized by the following criteria:
- The vastness of the affected area: huge holes, plaque or small, almost invisible points.
- Growth rate: growing quickly and causing rot, as well as those that start from a small inconspicuous point and retain their size for a long time.
- The presence or absence of rot, because traces of the disease can be wet and dry.
- Location of the source: in a leaf rosette that goes to the roots or appears on the upper young leaves.
Causes of Stains
The reasons for the appearance of white or other spots on the trunk of an orchid or on its leaves are bacterial, viral, fungal infections.
The source of infection is most often the soil. Inappropriate conditions of detention can provoke the appearance of spots on the phalaenopsis: dryness or excessive humidity in the room, a dark place or short daylight hours, location close to a heat source or to cold glass. Another cause of the spread of the disease is a nearby plant affected by a virus or bacteria. That is why phalaenopsis can not be placed with other colors.
The treatment of the plant depends on what characteristics are most suitable for the description. You can also predict the recovery period and the likelihood of the resumption of flowering.
Orchid diseases and their manifestations
The most common diseases of phalaenopsis, the symptoms of which are spotting of a different color, are:
- Powdery mildew, in which the leaves are covered with white plaque coming from a leaf outlet. Most often, the lower leaves are affected, after which the spotting passes to the roots and stem, eating and drying it from the inside.
- Brown rot, manifested by brown dots, quickly becoming wet spots. A secondary infection affects the roots, and together with the crown they turn into a loose, foul-smelling humus mass.
- Anthracnose, which looks like dots of black color, located on the outside of the leaves. For a long time, the disease does not manifest itself, but with the onset of winter colds and shortening of daylight, it progresses and quickly affects the entire bush.
- Rust, manifested by bright spots, initially noticeable only on the back of the phalaenopsis crown. When the flower weakens, the dots merge into a large dark spot, which becomes rusty.
- Light burns can also cause spotting. A prerequisite that thinning has appeared on the leaves is a violation of the rules for caring for the plant, which entailed the ingress and stagnation of moisture. Growing on the windowsill, where scorching sun rays fall, also provokes the disease. Light and dry areas over time cause complete drying of the leaf.
The most common phalaenopsis diseases
The most effective drugs
It is difficult to treat white spots on orchids, because the process takes a lot of time and requires patience. To combat ailments use:
- Fungicides are drugs whose action is aimed at getting rid of fungal diseases.
- Natural antibiotics are substances that can get rid of bacterial diseases, as well as biological compounds that have a general strengthening effect. All these drugs fulfill the task of root and foliar dressing, and are also a source of flora that can absorb pathogenic bacteria and spores of some varieties of the fungus.
- Chemicals, among which there are preparations of complex and directed exposure. The most famous substances are copper sulfate and lime, which together are called the Bordeaux mixture.
- At-hand substances, which are the simplest means for disinfecting the soil or foliar plant nutrition. These include potassium permanganate and hydrogen peroxide.
Treatment and prevention methods
The treatment that phalaenopsis is subjected to depends entirely on what disease the flower is affected. The correctly selected set of measures allows you to avoid the death of the plant, and also contributes to the rapid restoration of the flower after getting rid of spotting of various origin.
The first thing that is done in the treatment of phalaenopsis, which went white spots or places of rot appear, is to isolate the orchid from healthy flowers.
Proper treatment avoids plant death
The following measures are included in the complex of rehabilitation therapy:
- disinfection of soil in a pot;
- anti-stain treatment;
- creating the plant proper conditions and care.
The place for treatment should be in accordance with the requirements. It should not be too dark, because the lack of enough light weakens the phalaenopsis.
Anthracosis is treated by treating phalaenopsis with crushed activated carbon. The powder is treated with sections and places of removal of diseased shoots. The affected parts of the plants are cut with a knife preheated over a fire. After that, the plant is sprayed with preparations containing copper.
The recovery course lasts 10 days, during which 10 treatments are required. In the treatment of anthracnose should:
- limit moisture;
- provide plenty of bright sunlight;
- stop feeding.
Rust and black mold
Rust and black mold should be treated after removing all affected parts of the flower. The main treatment consists in spraying phalaenopsis with drugs such as:
All drugs used to get rid of black spots on orchid leaves are suitable for combating black spots on flowers. The concentration of solutions remains standard.
Rust and black mold are treated after removal of the affected parts of the flower
Defeat brown rot will be obtained by repeated treatment of infected phalaenopsis with a solution of potassium permanganate. The substance is dissolved in water until a violet hue is obtained, a cotton pad is dipped into the liquid, and then a solution is applied to the sections. Before treatment, all affected areas are excised.
The multiplicity of processing is 2 times a day, and the course lasts 3 days. After treatment, the plant should be at rest. If no rot spots appear within 14 days, phalaenopsis has recovered from the disease.
To deal with white spots, which are a manifestation of powdery mildew, most effectively with the help of the complex drug Fitosporin. It is used only as an independent therapy, because it contains live microorganisms that can absorb pathogens of bacterial diseases and aphids.
Before disinfection, all affected shoots are removed. After treatment, the plant provides good watering and a sufficient amount of light.
Phalaenopsis - tender indoor flowers. They are demanding of the conditions of detention and neighborhood. The slightest discrepancy leads to wilting, loss of buds and inflorescences, and then entails rapid death.
Therefore, any changes in the color of the deciduous cover, whether it is white, brown or black spots on the orchid, should definitely alert the breeders. The latter should take measures to avoid the loss of wildly blooming tropical favorites.