Diseases and pests of pelargonium


Pelargonia or geranium belongs to the geranium family that was born in South Africa. In our homes, to meet the geranium on the window sill — not a rare phenomenon, as the flower adapts well to the climate of the apartment and not only complements the interior, and serves as a cure for some diseases. It is known that the leaves of geranium helps with hypertension, pain in ear, tooth, joint and other spasmodic phenomena. Also, a leaf of geranium, applied to the wound can stop the bleeding, and squeezed a drop of juice for colds, if you bury them in the nose.

Geranium is a very beautiful flowering plant that has a large number of species, varieties and hybrids grown in the meadows, swamps, in forests and on private land and on the windowsill in a pot. Care for geraniums requires special approaches and attention, but the schedule of watering, lighting, fertilizing, transplanting, and temperature, for the geraniums will have to be. Improper care of the plant leads to negative signs of diseases of pelargonii. Its growth may slow down, the leaves are yellowing, and can also appear red and brown spots, swelling and dry patches. Flowering geraniums can be omitted or shortened. Why is this happening? If you dwell on specific cases, we can identify the following diseases of pelargonii:

Black leg

Black leg is a disease that affects not only plants, but also vegetables. The gradual darkening of the main trunk at the base, says the defeat of the root pathogenic fungus. Ground part of the plant responds with yellowing leaves. They appear spots of red and black color and dry ends, which leads to defoliation. In most cases, the fungus appears when waterlogged condition of the soil. Also, blackleg can join geranium, if it is planted in too large a container. Heavy soil, lack of air permeability and the accumulation of excess water, a favorite medium for the black legs. When planting geraniums to use garden soil, it is desirable to decontaminate her from spores of pathogens. In this case it is possible to microwave the soil or pour it fitosporin, which protects the plant not only from the black legs, but also from other types of decay.

Diseases and pests of pelargonium

Geranium, like all plants like moisture, but prolonged lack of watering does not always lead to plant diseases. Drought to flower more acceptable than excess moisture, so after a long downtime of a flower without water, watering should be scant, with a gradual softening dry clod of earth. The use of poor-quality water that is too hard or cold, from a faucet can cause yellow or reddish spots on the leaves, change colors, their fall, and the emergence of the black legs.

Giving the geraniums fresh air is a mandatory rule for its cultivation. If the flower is on the windowsill, in the warm he needs a mode of ventilation of the premises also, the geranium can be taken on the balcony or porch where the Windows are open for a long time. If a flower lives in a greenhouse climate, it may also be the cause of darkening the legs, that is, the root and the ground part of the stem. Sudden change in temperature or prolonged exposure of geranium in the cold, leads to disease for the plant.

In case of any infection that affects indoor plants, they need to be placed in home quarantine conditions, using separate items for care, to avoid spreading the disease to other flowers. Remaining after the death of the plant, the pot, have to handle or throw it away.

Treatment of this kind of rot does not lead to a positive effect. If geranium sick leaves and stem, then cut and transplant does not maintain the plant, and it is being destroyed. On the question why, the answer is that a species of fungus that causes «black foot», is insensitive to many drugs that are used for treatment. In order to avoid this disease, you need to arrange for the appropriate care and prevention from pests.

Verticillatae wilt – a disease that also is caused by the fungus a certain type. The fungus infects the soil under pelargonia, after which formed a yellow or red spots on the leaves of the flower. Later, the leaves lose color, become deformed, and weakly hold on to the petiole. This process starts with the lower leaves and gradually rises to the top. The infection may occur for a long time, even years. If the time to suspect the disease, its treatment involves cessation of irrigation for some time, removing damaged leaves, the use of fungicides and transplant the geraniums in the soil.

Diseases and pests of pelargonium

Verticillatae wilting — Diseases and pests of pelargonium

Why turn yellow and wither the leaves of geranium? Such symptoms observed with the defeat of plants of aphids.


Aphids – parasitic form of insects, small spiders. Their colonies settle on the stems, underside of leaves and buds of the plant. The aphid feeds on the juice of the flower and produces toxins in the form of sticky dew. The liquid glues the petals of a Bud, which is why he is not disclosed. Defeat parasite at home is pretty fast. Aphids moves to the surface parts of the plant, but also on neighboring cultures. As a result of defeat of aphids, pelargonia loses resistance to other diseases, that is, there is a greater chance of joining viral pathologies that cause stains, warping, rotting and plant death.

For prevention of aphid control, it is necessary to carefully monitor the plant and to observe the rules of care. To prevent too hot, humid and dry climates. To ensure the permeability of the soil and the access of fresh air to a ground part of geranium. Not to leave the geraniums for a long time under direct sunlight, and do not overfeed with fertilizers. To observe the phases of activity and rest of the flower in a timely manner to clean it from dried leaves and flowers, loosen the earth.

The temperature regime is expressed in keeping geraniums from the cold climate, so put in a place protected from drafts and flow of conditioned air. With the onset of cold weather, do not leave the plant on the balcony. To protect geraniums and other potted plants from distributors pathogens: flies, ants, butterflies. If home got flowers from the garden (roses, chrysanthemum), then do not ask why there were aphids on house plants? When detected, this pest, the crop should quickly be treated. For this, severely affected parts of the plants were removed and the rest rubbed with a soapy solution (used Laundry soap). After a bath, it is desirable to treat the geranium that for pyrethroids, i.e. drugs based on natural insecticides (fitoverm, INTA – VIR). To deal with pests can be and folk remedies which are not difficult to make at home. These include infusions with garlic, onion peel, soda, etc.

Diseases and pests of pelargonium

Aphids — Diseases and pests of pelargonium


Anthracnose – leaf spot of geranium, and also other indoor and garden plants caused by fungi. Their spores are striking the leaf surface and looks like a hairy bulges of red, yellow, brown, and brown. Defeat antraknoza is not rapidly, therefore, the identification of the first signs will help to quickly get rid of the disease. For this, you need to remove the damaged parts of the plants to reduce humidity and make the treatment of the flower a natural insecticide. The positive effects observed in the treatment with colloidal sulphur, Bordeaux or liquid copper sulfate.

Diseases and pests of pelargonium

Anthracnose — Diseases and pests of pelargonium


Rust – rust fungi, which form an oval or circular pustules on the lower side of the leaf, root many plants. On top of the leaf plate marked with red spots. The cause of rust appearance is a violation of the schedule of watering and increase humidity. Treatment of disease confined to the purification plants and the treatment with fungicides.

Diseases and pests of pelargonium

Rust — Diseases and pests of pelargonium

Pelargonium attacked several diseases, which include: powdery mildew, gray mold, vascular bacteriosis, Fusarium, fillettes and others. Their causes, mainly, the reduction of immune forces of the plant, the result of substandard care. Due to the weakening becomes the accession of pathogenic microflora, which is recognized by certain signs. The appearance of these symptoms, you may notice, provided that:

  • soil for planting is not pre-sanitized;
  • geraniums purchased on natural market;
  • humidity and lighting does not meet the requirements of growing pelargonii;
  • the location is not suitable for flower (crowding, mechanical damage);
  • prolonged exposure of the flower on the street space;
  • watering the plants with tap water or river, as well as lack or excess of irrigation;
  • disrupted the schedule of fertilizing with mineral fertilizers and transplanting the flower.

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