Pests and diseases of indoor lemon

In the process of growing indoor lemon florists often encounter its diseases and pests. The affected citrus tree loses its decorative appearance, ceases to bloom, bear fruit, and often dies. Knowing the main causes of lemon disease and treating them at home helps to avoid difficulties in growing.

Pests and diseases of indoor lemon

Why is lemon sick?

This exotic plant is affected by diseases and pests in the following cases:

  • in the process of inoculation with a sick handle;
  • improper care: landing in contaminated soil, too frequent or rare watering, inadequate lighting, illiterate pruning or insufficient soil fertilizer;
  • the plant did not manage to get stronger after a previous illness;
  • infection of healthy home specimens with street;
  • bacteria, viruses and fungi getting into the room during ventilation;
  • making mistakes in the process of reproduction, planting and transplantation.

Classification of diseases

Indoor lemon diseases are divided into 2 groups:

  • viral;
  • fungal.

For each disease, a specific treatment regimen using special drugs is used.


Diseases of indoor lemons caused by viruses lead to massive loss of leaves on a tree. After such sores, the plant becomes completely exposed, often dies. It is advisable for beginning flower growers to familiarize themselves with their description and methods of control.

Mosaic sheet

Dark and light strokes appear on the leaves of the affected specimen, in appearance resembling a mosaic. Over time, they become pale or completely white, lose their shape. Young lemon leaves develop deformed. With leaf mosaic, the tree stops growth.

If a lemon falls ill with this disease, it is quarantined, away from healthy specimens. It is impossible to completely get rid of sheet mosaic, because at the moment there are no drugs for this sore. All that you can do is to alleviate the symptoms of its course, ensuring proper care, and first of all - balanced and regular feeding. Heavily affected specimens must be destroyed.

Citrus cancer

This disease on the leaves of a lemon looks like brown spots. Also, it is characterized by the appearance of brown spots on the fruits. With a prolonged course of the disease, the young leaves of lemon are deformed and acquire an ugly shape. The fruits are wrinkled and do not develop. Over time, such an instance dies.

Treatment of this disease of home lemons is impossible, therefore, in order to prevent it, preventive measures are being taken: spring treatment with fungicides of liquid copper.


There is no way to save the infected tree

The first sign that a tristeza appeared on a houseplant is a massive fall of foliage. Further, the bark and shoots, which are covered with brown spots, die off. The specimen infected with tristeza is not subject to treatment and quickly dies.

Most often, lemons suffer from viral infections, provided illiterate care and during a period of weakened immunity.

Fungal and infectious

The defeat of lemons with a fungus or infection at home is not uncommon. The reasons are the same as when infected with viral diseases.


The presence of elongated brown spots on the branches and trunk are the first signs of homosis. The bark under these spots quickly dies and begins to crack. At the places of the cracks, a golden sticky substance is formed, which quickly hardens.

The main causes of the development of homemade lemon disease are mechanical damage to the bark (breaks, cracks), increased humidity in the room, lack of phosphorus-potassium fertilizers in the soil, an excess of nitrogen, planting in already contaminated soil, or too deep penetration of the stem.

To treat a diseased instance is as follows: remove the infected bark on the trunk, cut off the strongly affected shoots. The places of stripping and trimming should be treated with any 3% concentration fungicide and glossed over with garden var.

The duration of treatment will depend on the degree of damage to the tree. Processing is carried out until brown spots cease to form.


Of all the diseases, indoor lemons are most often affected by anthracnosis. It is determined that this sore appears on the lemon, according to the leaves: they massively fall off. But first, the leaf plate turns white or yellow. Flower buds also fall. Fruits are covered with reddish spots.

Control measures - removal of dead branches and infected leaves. Three-fold treatment of the affected specimen with the Fitosporin preparation. Another option is to treat the tree with a 1% solution of Bordeaux mixture.


Scab is another dangerous disease of indoor lemons. Young foliage is covered with yellow spots, which after a while are converted into pink-gray growths. The leaves on which such a plaque appears die off. The fungus continues to parasitize, spreading to leaf petioles and adjacent shoots. Orange spots on the skin of the fruits also indicate the appearance of this sore. After a while, they darken and turn dark red. At an advanced stage, blackening is noticeable in the lesion sites.

The tree begins to be treated by spraying with a 1% Bordeaux mixture. Pre-remove all affected parts on the crown.


All affected trees must be destroyed.

When a Melseko infection occurs, the tree branches at the tips begin to dry out, the leaves are massively showered. On the branches, the branches acquire a reddish tint.

The reason is improper care, or rather, a lack of light in the winter. There is no point in fighting this disease, because all methods are useless. The only thing required is a regular inspection of the tree for signs of symptoms.

Affected specimens are subject to destruction.

Root rot

Often, indoor lemons fall leaves. When falling 1-2 leaves do not worry: this is a natural process. With massive leaf fall, it is worth digging out a tree and inspecting its root system.

If the roots become dark, moldy and soft to the touch, the tree is affected by root rot. All decayed parts are cut with a sterile knife or secateurs. Sliced ​​places are powdered with crushed charcoal. Next, a transplant is carried out in a new pot.

The transplanted lemon is placed in a well-lit place with protection from the scorching sun. Watering is allowed only a week after transplantation to prevent repeated rotting of the root system.


In addition to fungal and viral diseases, there are various pests of indoor lemon.


Sticky leaves on a lemon are the first sign of a scab. This parasite in appearance resembles microscopic tubercles on the surface of shoots and foliage. Females settle on the underside of the leaf plate. Larvae hatch from eggs laid on the underside of the leaf, which spread over its entire surface. An affected specimen with a sticky coating becomes weak, quickly withers and is susceptible to infection by a number of diseases.

The treatment of diseases of homemade lemon is carried out using insecticides or a soap solution. For 1 liter of water, spend 2 tbsp. l any liquid soap. Process all the parts that are tuberous.

After processing, the tree is washed in the shower. After 2-3 days, the treatment procedure is repeated.

Common aphid

The massive appearance of light green aphids is noticeable on young shoots. Green, juicy branches have not yet had time to grow bark and are an excellent food for parasites. Pests first hit the lower part of the leaf plate, then move to its upper part, sucking juices from the tissues. As a result, the leaves of homemade lemon curl and dry out. Sticky droplets appear in the affected areas. Such plaque serves as the basis for the development of soot fungus - a dangerous disease that leads to death.

Trim the tops with the insects

With a minor lesion, they trim the affected parts along with insects. If the aphid has spread to the entire plant, the crown is treated with garlic infusion (4 peeled and chopped garlic heads are infused in 5 l of water for a day). Also, insecticides are used to treat infected specimens.

Root aphid

Unlike the previous pest, this harmful insect parasitizes in the ground, affecting the delicate root system.

To notice how this pest appears, it turns out in the appearance of the plant. It becomes lethargic, stops growth, leaves become drooping and turn yellow.

Such a tree is removed from the pot, its roots are sprayed with a contact insecticide or a weak garlic infusion, after which it is transplanted into a new container, having previously sterilized the planting soil.

Spider mite

Often a spider mite appears on a lemon. These lemon pests appear in conditions of drought and low humidity in the room. They affect young leaves and twigs. The appearance of a small web on a lemon indicates the spread of the tick.

The mite is destroyed at home by four times treatment with a 1% solution of boric acid. The interval between treatments is 5 days.

If a lemon affects a spider mite, they increase the humidity level in the room and carry out frequent irrigation of the aerial parts.

Preventative measures

To prevent the appearance of diseases and pests on this exotic plant, the gardener requires not only compliance with agricultural regulations, but also the provision of competent care. First of all, such measures should be aimed at increasing the immunity of the plant and its resistance to infection.

To prevent chlorosis (an imbalance in the distribution of chlorophyll), to activate the growth and development of a plant is possible by applying the following composition in the nutrition of an indoor tree:

  • ammonium nitrate - 15 g;
  • vitriol - 3 g;
  • boric acid - 5 g;
  • potassium sulfate - 15 g.

The dry mixture is dissolved in 10 l of water. Lemons are watered with a nutrient solution no more than once every 5 months.

This composition protects indoor citrus from damage by fungal, viral and infectious diseases. It gently stimulates the healthy development of plants.

In the process of growing lemon, it is important:

  • regularly inspect for the presence of diseases and parasites;
  • provide the culture with timely care and the necessary conditions of detention;
  • carry out regular moisturizing of the crown: irrigate daily, shower once a month;
  • treat the crown with soapy foam every month to disinfect it.


Despite the fact that the citrus tree is susceptible to many diseases and pests, it is not difficult to prevent their appearance. It is only necessary to observe preventive measures, to pay attention and care to the plant, and then it will thank a healthy and decorative look.


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