How to get rid of a spider mite in a greenhouse?

Many gardeners and gardeners encounter in their possessions a thin cobweb that envelops trees, bushes, and also notice sick leaves, which then fall off. In this case, it is highly likely that the site is infected with a spider mite, which will be discussed in the article.

Description of the spider mite

The creature in question is a small arthropod feeding on plant sap. It has tiny sizes: females grow up to 0.6 mm, and males grow up to 0.45 mm. Lives in all parts of the planet, except Antarctica. The characteristic habitat is trees or grasses; species that feed on conifers are less common.

What is the danger of the pest

The vital activity of these insects is able to kill plantings. Ticks feed on cell sap, injecting an enzyme synthesized inside the salivary glands - it destroys the structure of the cell. As a result, the plants begin to hurt, lose color, and dry.

Initially, the parasite is quite difficult to detect, especially by accident. They populate the lower half of the leaves, immediately begin to actively absorb the juice, multiply. Gradually, small dark spots appear - waste products, and from above the sheets become like marble due to small yellow dots, the dimensions of which are gradually increasing.

The final stage of the disease - the whole plant is wrapped in cobwebs. Damaged areas acquire white spots, which gradually increase, forming whitish zones. Soon the plant ceases to bloom, becomes susceptible to various diseases, begins to poorly synthesize, buds dry closed, all its parts gradually fall off. All this as a whole leads to huge crop losses.

Important! In many cases, the web is a secondary confirmation of the presence of a pest. Quite often it is absent.

In addition to this infection, various infections are transmitted, because arachnids easily move through seedlings thanks to the web. Some species (monophages) prefer only one particular variety of trees or shrubs. Others (oligophages) are less picky and make up their diet from several plants. Polyphages can eat many varieties with food.

Garden plants that can be eaten by different types of spider mites are presented in the table:

Ordinarylegumes, grains, grapes, fruit, decorative, berry
Redlemons, roses, orchids, nightshade, calla lilies, cineraria, balsam
Hawthornhawthorn, cherry plum, apple tree, irge, mountain ash, apricot, plum
Datedate palm, melon, cereals, eggplant
Turkestancorn, elm, quince, watermelon, nutmeg pumpkin, quinoa, seed cucumber, datura ordinary, field bindweed, melon, burdock ordinary, acacia, ordinary cuff, white willow
Atlanticclover, pears, apple trees, alfalfa, cotton, strawberries
Petrobia polyphagousstrawberries, legumes, cucumbers, clover, garlic, asparagus, cereals, more than 200
Red fruitmore often - pink, less often - linden, oak, alder, grapes, mulberry
Red citrusall citrus

  • Indoor flowers for which the tick is dangerous:
  • ivy;
  • violet;
  • Anthurium
  • the Rose;
  • dracaena;
  • ficus;
  • balsam;
  • calla;
  • fuchsia;
  • azalea.

Video: Spider mite in the greenhouse: what to do?

Where winters in the greenhouse

Ticks prefer warm conditions. Greenhouses are the best places for their wintering, breeding, and life activities in general, as the air temperature there ranges from +25 to + 32 ° C, and humidity - from 35 to 60%. In winter, pests take shelter underground, but when spring comes out, populate the tops and shrubs.

For the most part, spider mites settle on top of eggplant, tomatoes, grapes, cucumbers, apple trees, but sometimes other crops are susceptible to infection. When a bad, lean year comes, pests can populate even the weed. They get into the greenhouse quite easily: from the clothes of the gardener, animal hair, seedlings, etc. Initially, the plants that grow near the aisle in the greenhouse suffer, because they are easier to populate.

Important! The main reason for the appearance and active reproduction of small pests is excessive fertilizer of the soil with phosphorus. Initially, phosphorus scares away, kills other insects that eat mostly the described type of arthropods, which leads to the appearance of the latter in large quantities.

Ways to combat the spider mite in the greenhouse

The problem under consideration is very common, but it can be difficult to notice pests right away. They are practically not afraid of traditional methods of struggle, so it is quite difficult to destroy them. Consider the existing methods of destruction.


Ticks easily resist most insecticides. However, there are chemicals that can scare them away and destroy them - these include acaricides that kill all subspecies of the arthropod. An insecticide is also an effective substance in the fight.

The use of chemicals is an extreme case. It is recommended to resort to it when the other methods (biological, folk, agricultural) failed.

The following drugs are used:

  • Fitoverm;
  • “Akarin”;
  • “Tick-borne”;
  • "Vertimek";
  • Agravertin;
  • sticks "Plant Pin", "Etisso", "Substral", "Green House".

When these agents do not have an effect, they use stronger drugs - Actellik or Bi-58. It is important to consider that the soil must be well prepared before using the above products.

Also learn how to cultivate land in a greenhouse in the fall from diseases and pests.

Soil preparation steps:

  1. Water abundantly.
  2. Prepare a solution of the selected drug according to the instructions - to better envelop, mix in the green potash soap.
  3. Make sure that the medicine bypasses the root.

To process seedlings, the soil needs several times - 5 with an interval of 10 days.


The most environmentally friendly way to fight.

There are several directions:

  1. Population of the infected area with other insect enemies. These include predator ticks that eat exclusively the mentioned parasites.
  2. Planting repellent plants in the winter road that spread a tick repellent odor.
  3. The use of acaricides of biological nature based on mushrooms ("Bicol", "BTB").


The method is based on the use of various drugs, herbal decoctions, infusions. Folk is considered the most popular, because it uses the funds available from every summer owner. Did you know? For a person, different from the crop, the spider mite is absolutely safe.

Most often, similar methods are used:

  1. Watering the beds with infusion of potato tops. Arachnids will die, but the eggs will be intact. It is necessary to repeat the procedure 3-4 times.
  2. The use of various aromatic herbs - dope ordinary, extract from garlic, alder.
  3. Irrigation with a decoction of potato tops with the addition of laundry soap. Helps fight arachnids, aphids and the like.
  4. Watering the infusion of onion peels.
  5. Irrigation with vinegar, ammonia, hydrogen peroxide.
  6. Rubbing with infusions of garlic, yarrow, horseradish.
  7. The most popular method is spraying with a solution of laundry soap.


It consists in processing the garden with various devices.

Mandatory tricks:

  1. Digging during the autumn-spring period, weeding from weed, harvesting spoiled, dead leaves, plant debris, fruits.
  2. Annual disinfection at the onset of the summer season with sulfur drafts, bleach.
  3. Alternating planting of seedlings with those for which ticks are harmless.
  4. Leaving wide empty rows between the beds.
  5. Spraying with water from a spray bottle.

A wonderful way is to fumigate with sulfuric drafts of a polycarbonate greenhouse. This is a good prevention of infections, the fight against parasites, as the spreading smoke penetrates into all possible cracks.

Sulfur checker must be used clearly according to the instructions.

After spraying for 2-3 days, all doors and openings must be closed, after which it is important to ventilate well. Thus, it is possible to get rid of ticks with a probability of 100%.

How to process a greenhouse

At different times of the year, prevention and control are a little different. How exactly, we will consider further.


Check out

How and what to process the greenhouse in the fall and prepare it for winter If ticks are wound up in the greenhouse by the end of summer, then, after harvesting, the cover should be replaced, completely getting rid of the old one.

If it is difficult to do so directly, it is worth filling everything with snow.

After that, general cleaning should be organized: completely wash the entire structure, disinfect with a solution of acaricidal agents or copper sulfate (5%), bleach solution (5%).

To prepare the latter, you need to dilute a full bucket of water with 500 g of the substance. The film with which the winter garden is covered must be left until spring. In the fall, it is also worth using sulfur drafts.

In the spring

At this time, it makes sense to process if your or the neighboring site suffered earlier, since in this case there is a high probability that the pests hid in large numbers in winter, and in the spring they will necessarily begin active life activities. However, if they avoided your territory, spring processing would be superfluous.

Sometimes irrigation alone is not enough: it will not lead to the necessary result, because the soil and the walls of the greenhouse remain infected. You need to start processing in the spring from the soil, because the insect hibernates directly there. The film should be removed just in the spring, and then destroyed. Then you need abundant watering. If infected parts are found, they should be torn and burned.

Quite effective in controlling parasites are watering with acaricidal solutions or instillation of special sticks, which after watering dissolve, enter the root system and spread pesticides inside the plant.

We recommend you familiarize yourself with: processing the polycarbonate greenhouse from diseases and pests in the spring.

Preventive measures

The tick is incredibly resistant to many difficult conditions. However, if prophylaxis is carried out, then infection will be prevented. Of course, it is easier to protect indoor flowers from them, while greenhouse ones are much more difficult to save.

There are such preventive measures:

  1. Try to plant shrubs as far away as possible.
  2. Maintaining air humidity inside the greenhouse with a level of 80–90%, as well as temperatures up to 25 ° C, will create inappropriate conditions for their life.
  3. Also, in order to protect the crop, irrigation of trunks with acaricides is suitable.
  4. Planting a number of marigolds alongside will help to reduce migration, reduce the pest settlement.
  5. Processing, weeding, digging, harvesting spoiled fruits, crops, inspection for the presence of white spots is also required.
  6. It is imperative to clean and tidy the inside of the covered area in the fall, before wintering. Sometimes soil replacement is required.
  7. Arachnids do not feel well with ultraviolet radiation, so 2 times a week it is worth irradiating the area with ultraviolet light.
  8. New indoor flowers should be quarantined for the first time. It is imperative to maintain humidity by spraying. Before planting crops, it is important to sanitize the soil mixture - pour plenty of boiling water on it, hold it in the oven at a temperature of 180 ° C, and boil it in a water bath.

Did you know? Ticks do not live very long - 30-50 days. However, during this period, the female lays up to 400 eggs, of which only 3 individuals are born in 3 days.

A spider mite is a rather significant danger in the process of growing plants: the entire crop may suffer, therefore it is very important to resort to effective methods of prevention and control. Despite the fact that it is quite difficult, do not despair, but continue to use an integrated approach.

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