Spider mite: how to treat the greenhouse

How to treat the greenhouse from the spider mite in autumn, so that the pest does not have a chance

How to treat a greenhouse in the fall against spider mite so the pest doesn't stand a chance

Spider mite – a common pest that attacks plants at home and in the garden, in the open ground and in the greenhouse. To protect the crop, a preventive treatment is necessary, and if the infestation could not be avoided, a targeted pest control.

How dangerous is the spider mite

The spider mite is a dangerous pest that affects garden plants. Plants planted in the greenhouse fall into a special risk zone – the higher the air temperature and lower the humidity, the more active the pest reproduces.

It is problematic to notice it with the naked eye. The length of an adult does not exceed 1 mm. The spider mite develops due to its developed survival skills – for several years the eggs remain within reach, and adults are not afraid of the frosts of the Urals and Siberia.

Spider mite

It is almost impossible to notice the spider mite on a plant, based on its size

The pest becomes active near the end of spring. It enters the greenhouse in different ways – through open doors and windows with the floor, planting material. Spider mite feeds on plant sap, the first signs of damage-yellow-white dots that are attracted to the inside of leaves. Affected specimens then become braided with thin “spider webs”, along which the pest moves. Within 4-6 weeks of infection, the plant withers and dies.

The symptoms of spider mite infestation

If nothing is done, the plant dies fairly quickly.

Prevention of the appearance of spider mite in the greenhouse is carried out in spring and autumn. If the attack of pests could not be avoided, a more thorough treatment is required in the fall. To her proceed after harvesting. Calculate the time, leaving another 2-3 weeks before frosts.

Preparation of the greenhouse for treatment against pests

Lack of necessary preparation will also negate the effect of proper treatment:

    Remove all plant waste from the greenhouse. It should not be kept anywhere on the plot. Better weeds, spoiled fruits, roots, leaves and other plant parts.

Ground in the greenhouse

Before treatment against spider mite, rid the beds in the greenhouse of garbage and get rid of all plant debris.

Container for watering

Anything that can be taken out of the greenhouse.

Soil change

Replacing all the soil in the greenhouse is a labor-intensive task. Most often it is limited to removing the top 5-7 cm.

Clean the greenhouse

By removing the visible dirt, the anti-caricidal treatment becomes more effective

Potassium persulfate solution

Potassium permanganate solution is one of the most available disinfectants.

Removed lime

Lime flush effectively destroys both spider mites, waves under greenhouses, and their eggs

How to treat a pattern in the fall to kill spider mites

Spider mite is not an insect, so insecticides are completely useless in the fight against it. Even the mass-bred pest is not particularly susceptible to folk remedies, they are more often used for preventive treatment.

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Biological methods of control

The spider mite has natural enemies. These are, for example, Aphidimysis gallica (predatory mosquitoes), Phytoseiulus, and Svirsky amblysius. It is recommended to enclose the first two in the greenhouse in spring and summer, but the latter is out of range and can protect the greenhouse year-round. Amblyseus svirskii is a predatory acariphage that has successfully adapted to the conditions of the Russian climate. You can order a container with biological material in a special store. To do this, it is enough to move it to the greenhouse.

Amblysium Svirsky

Amblysia Svirsky lives no more than a month, but during this period the acariphage manages to significantly reduce the population of spider mite in the greenhouse and give offspring

home remedies

Their main advantage is safety for the ecology and health of humans, pets and beneficial fauna. But in the fall, when the crops are harvested, this is no longer so relevant. In the case of mass infestation, folk remedies will not help, but for prevention (disinfection of the soil and washing the greenhouse), if you are a conductor of natural agriculture, will be quite suitable:

    decoction of tobacco. It is desirable to use adult fresh or dried leaves independently. About 200 g of raw materials pour 3 liters of boiling water and leave for about a day and a half. Then simmer for 2-3 hours over low heat. The finished broth is filtered and poured more water, bringing the total volume to 5 liters.

Tobacco leaves

Tobacco – tobacco leaves for adults can be replaced by the contents of cheap strong cigarettes


Calendula – a very useful plant, it not only decorates the garden, but is also widely used in folk medicine, repelling many pests and helping to combat them

Garlic shoots

Do not rush to throw away the garlic shoots – the pungent smell of their infusion is unpleasant for many pests

chemical products

Special preparations – acaricides – are used to combat the spider mite. There are also insectocaricides, which are effective against both mites and insects. Further, when working with the chemical, you must follow the instructions in the manual and use personal protective equipment (goggles, respirators, gloves). Ready solution is poured over the soil, and all surfaces in the prepared greenhouse are treated.

Treatment with greenhouse chemicals

Even if the preparation is considered safe for humans, you should not neglect personal protective equipment: everyone has different skin sensitivity, you can never rule out an allergy. It is also possible to make a mistake with the dosage of the solution.

What can be used:

    Actara. The main active ingredient is thiamethoxam. Officially, it is not an acaricide, but many gardeners, using it, note a positive effect. After treatment with Actara, not only insects, but also phytophagous mites die in the greenhouse.


Actara is not an acaricide, but many gardeners note that the drug helped them in the fight against spider mites


Fytoverm is very popular among gardeners because of the variety of insectoaricidal biological effects

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Ant i-leshesch

Treating greenhouse with Antikitsch does not prevent the use of fertilizers and other chemicals


Aktellik is a toxic preparation, suitable only for autumn treatment of the greenhouse


Apollo destroys not spider mites but their future generations


Preparation t-Granni in the case of spider mites

Video: description of acaricide preparations

An alternative to acaricides is a sulfur sample. It should simply be ignited in a hermetically closed greenhouse. To improve the effect, all surfaces are moistened with water from the inside. You can enter the greenhouse only 4-5 days after treatment.

Greenhouse treatment with sulfur tester

Sulfur treatment is not recommended for greenhouses with a metal frame, a structure that corrodes when exposed to sulfuric acid and causes corrosion

Video: Checking a greenhouse with a sulfur tester

Horticulturist Recommendations

This year I also encountered a spider mite. It was in my greenhouse and only on the eggplants. Usually I forget the whole garden and vegetable garden in the spring with urea, including the greenhouse, but this year the solution to the problem attracted, and the greenhouse was left unattended at the cottage. The result was not long in coming. I had to fry the greenhouse in the fall with a saber. Well, the fall treatment with urea. Spilled the entire floor, the mite, they say, overwintered there.



Treat the greenhouse on a warm day with a solution of Fitevermus or Agravertin. Burn metal parts and trellis wire with a blowtorch. Collect plant debris. But in fact, the mite has already hidden in hard-to-reach places, and there is no more power to endure it. Get ready for the spring battle.



If plants are already removed in the greenhouse, burn them with a sulfur tester. Just be careful. The combustion product, sulfur dioxide, is very toxic and burns mucous membranes.



You can try Granny’s remedy, it works well against the mite. And I also used Apollo on tomatoes from thrips and mites.



The spider mite overwinters in leftover organic bits and cracks in the greenhouse. Just Acaricide in the greenhouse won’t take it. Put a sulfur test on it. The smoke will penetrate all the crevices and get the mite. This should have been done in the fall, and now in the spring before planting.

ღ – M@rin@- ღ


Fall is a very good time to treat the greenhouse for spider mites. The crop is already harvested, you can even use strong acaricides without risk to your health. The best effect gives a combination of all methods of control – biological, chemical and folk remedies.

How to treat greenhouse from spider mites in autumn

How to treat a greenhouse in autumn from a spider mite


Treatment of the greenhouse from spider mite in autumn is more of a preventive than mandatory nature. It is carried out if the pests in the greenhouse were noticed in the summer. By carrying out the work in autumn, stronger chemicals can be used to control them in order to kill all the individuals left in the ground for wintering.

Garden path.

How to treat a greenhouse from a spider mite in autumn

The dangers of spider mites in the greenhouse

Typically, spider mites appear in the greenhouse in early spring or during the growing season. The early appearance of the pests means that oviposition took place in the fall. In summer, mites get in regardless of the plantings that found a number of plantings, from vegetable growers on shoes or clothing, and can also be transmitted to pets.

The spider mite is a microscopic spider insect. The size of an adult insect is about 1 mm. It has 4 pairs of legs and a brown or dark orange body. The mite has no wings and tendrils. But it has powerful needles, with which it can bore through leaves and drink sap.

The main problems in controlling the spider mite in the greenhouse are:

  • the difficulty of identifying it with a weak spread;
  • hurricane breeding – one individual lays 400 eggs per summer;
  • high immunity of spider mite against many modern insecticides and the ability to produce it with constant application of the same means.

Due to these properties, the spider mite quickly spreads over the plot. The fight against it must begin immediately, otherwise there is a great risk of losing most of the crop. The final treatment of greenhouses takes place in autumn, so the warfare will not begin again next year.

The most favorable place for the development of spider mite are greenhouses, which is facilitated by high air temperature and low humidity.

How to treat a greenhouse in autumn from a spider mite

If we talk about preferences, cucumbers are most often under attack. Solanaceous plants grown in greenhouses are less susceptible to pest attacks. Tomato tops are practically intolerable to peppers; peppers have small leaf plates. However, with a strong spread and a small amount of food, the spider mite is no stranger to peppers, zucchini, pumpkins, and some berry and flower crops.

Delayed development of plants, weak flowering and the presence of non-flowering should attract the attention of gardeners. And, of course, the change in the color of the leaf plates. In cucumbers, it becomes gray. This is a reason to carefully inspect the bushes, especially the lower levels of leaves. The appearance of light gray rounded bubbles along the veins on the inside of the leaves indicates the presence of spider mite.

Note: Vegetable growers often emphasize the presence of spider mites. And quite in vain. Bright dense spider webs entangling the leaves and stems mean more than one generation of pests and a threat to the crop.

On the one hand, spider mites themselves cause great harm to plants by drinking their sap. On the other hand, spider mites disrupt photosynthesis. If you don’t take action, the leaves will wither first, and then the plant will die.

Preparing the greenhouse

Autumn treatment of the greenhouse against spider mite involves preparation for this process.

How to treat a greenhouse in autumn from a spider mite

First of all, all remains of plants are removed from the greenhouse, weeds are thoroughly weeded. If there is such a possibility, it is worth to completely replace the soil in the greenhouse.

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In the autumn, all parts of the structure are thoroughly treated with chemicals. Polycarbonate is also washed with specially prepared solutions of copper sulfate or chlorine lime. The film is removed. Some gardeners argue that the film can be left for the winter. But between it and the conductors, egg clutches and sometimes adults can remain.

Timing of treatment

Treat greenhouses from spider mite in the fall after the end of the harvest. In this case, the chemicals, with which the vegetables are stuffed, will not harm the human body. And in the greenhouse with plants it is easy to get to all the corners where pests can hide.

There is no strict time limit for processing. Much depends on the region, the crop grown, the availability of free time. If in summer there were large attacks of spider mite, then in the fall with the processing do not delay. In the first months of autumn, there is still something that can benefit the uncomfortable neighbor’s dacha plot. Therefore, there is a high probability of its spread. Insects feed and harm plants until the air temperature drops to 12 degrees Celsius.

How to treat a greenhouse from a mite in autumn

Strong insecticides and biological means are widely used to treat greenhouses in the fall. The use of folk methods does not give special effect in autumn. Their action is mainly aimed at repelling, but not at destroying the spider mite. Nevertheless, they should also be taken into account.

How to treat a greenhouse in autumn from a mite

chemical products

Conventional chemical preparations for garden and vegetable garden pest control affect multiple applications of different preparations. For such purposes, “FitoMus”, “Klechevit”, “Akarin”, “Aktellik”, “Bi-58” are suitable. Try to choose phosphorus- or sulfur-containing preparations. According to biologists and gardeners, the popular chlorine has already lost its effectiveness.

Greenhouses are treated as follows.

  • The floor of the greenhouse is replaced or thoroughly recoated.
  • The walls and structures of the greenhouse are treated with a 5% solution of copper sulfate or chlorine lime. Recently, sulfuric lime has become popular. After all, smoke penetrates into the most inaccessible places.
  • An insecticide solution is prepared and watered or sprinkled with a large amount of water. The last point should preferably be done 2-3 times at intervals of 10-12 days. It is during this time that new offspring emerge from the clutch.

Attention! All chemicals work only on living individuals. Therefore, do not hope to remove the spider mite in the greenhouse in the fall.

Most drugs have a higher hazard class. The greenhouse is a closed room. You must use protective equipment: gloves, goggles and respirators when treating.

Biological products

Biological preparations are made on the basis of spores of fungi that affect various organs of spider mites. Some, such as “Granmait,” kill the mites and their larvae but do not harm the eggs. “Borneo” gets rid of mites at any stage. The preparations “Fluomait” and “Apollo” cause hormonal disorders, and women stop in the greenhouse.

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How to treat a greenhouse after a spider mite in autumn

The characteristic feature of these drugs is the relative safety for humans and animals.

Interesting fact! Squeezing phytoseiulus mite in the greenhouse is an excellent way to combat spider mite. It will quickly destroy the pest both in summer and in early autumn. At the same time, it is absolutely safe for people, pets, fish and insects. It is sold in garden stores. Unfortunately, not everyone has it.

Treatment is also carried out as with insecticides. Both the structure itself and the floor are treated. It is desirable to carry out 2 treatments in autumn and just before preparing the greenhouse for planting vegetables and in the third source. In the fall, the preparations, whose action is aimed at the destruction of mites, will be destroyed.

Home remedy

Folk remedies to expel spider mite in greenhouses in the fall are rarely used. Mainly if the pest is noticed on fruit plants in late summer – early September and there is a desire to preserve the harvest. The most effective is to treat the greenhouse:

  • A half-hour infusion of tomato clay at the rate of 0.5 kg of crushed tops and a tablespoon of liquid soap per 10 liters of water;
  • Daily infusion of onion or garlic shells, prepared from 0.5 bucket of onions and 5 liters of water.

In late autumn or early winter, the floor in the greenhouse is covered with snow to a height of 30 to 50 cm. This method will help to get rid not only of spider mite, but also of fungal spores and pathogenic bacteria.

Spider mite treatment in autumn


It is important not only to treat the greenhouse from spider mite in the fall, but also to observe preventive measures during the season. It is desirable to adhere to the rules of plant rotation, but this is not always possible. Therefore:

  • Keep the greenhouse clean to regularly suspend it, do not arrange compost piles next to the greenhouses.
  • Do not allow high temperatures and high humidity if you grow cucumber in the greenhouse;
  • Conduct fertilization with a complex fertilizer containing phosphorus;
  • Sharp plants such as onions, garlic, marigolds or marigolds are planted in the greenhouse.

Regular inspection of the plants in the greenhouse helps to recognize the problem at the very beginning, which contributes to saving the crop and getting rid of the spinning mite in time.


Treating the greenhouse in the fall against the spinning mite is necessary if it is there. This does not mean that otherwise greenhouses can remain untreated. no At least minimal treatment is a necessary step in preparing the site for winter and the next spring season.

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