Spider mites

Adult individuals reach a size of only 0.3–0.6 mm, making them difficult to spot with the naked eye without a magnifying glass. The body is oval-shaped, and the color varies from greenish to yellowish or reddish-brown depending on the species and feeding conditions.

The mite's life cycle goes through several stages: egg, larva, protonymph, deutonymph, and adult (imago). Under favorable conditions, the entire cycle can be completed in 7–10 days, leading to a rapid increase in the population.

One of the key features of this group is the ability to spin thin webbing on the underside of leaves. This web serves not only as protection for the colony but also as a network for the pests to move across the plant.

Reproduction occurs extremely intensively in conditions of low humidity and high temperatures. Females lay hundreds of eggs, which remain viable even in unfavorable external environmental conditions.

Spider mites are polyphagous, meaning they damage a huge number of agricultural and ornamental crops. The risk group includes vegetables, fruit trees, berry bushes, grapevines, and houseplants.

The pest poses a particular danger to greenhouse facilities, where it can destroy crops of cucumbers, tomatoes, eggplants, and peppers in a very short time.

In open fields, mites cause serious damage to strawberry plantings, soybeans, cotton, as well as vineyards and young fruit tree seedlings. Affected plants suffer significant losses in marketable quality and yield.

On ornamental plants, mite activity leads to a loss of aesthetic appeal, leaf deformation, and premature bud drop. In some cases, severe infestation can lead to the death of the entire plant.

In addition to direct physical damage to tissues, mites transmit various viral and fungal plant diseases, making their indirect impact even more devastating for agroecosystems.

The mass appearance and activity of spider mites occur during hot and dry periods of the growing season. Temperatures above +25°C and low air humidity are optimal for them.

In greenhouses, the pest can remain active year-round if temperature regimes and sanitary standards are not maintained. Humidity fluctuations in indoor conditions contribute to mite outbreaks.

Overwintering female spider mites are capable of surviving the cold season by hiding in plant debris, tree bark crevices, soil, or under fallen leaves. As the weather warms, they migrate to young shoots.

The intensity of reproduction increases in the second half of summer when the population accumulation reaches its peak. It is during this period that maximum spread of the pest to adjacent areas is observed.

Autumn temperature drops and shorter daylight hours trigger females to enter diapause, preparing for hibernation in protected places. Timely monitoring during this period is critical for reducing the pest load for the following year.

The first sign of infestation is the appearance of tiny light dots on the upper side of the leaves. These are puncture sites through which the mite sucks out cell sap, damaging chlorophyll-bearing tissues.

Gradually, these dots merge into single light-colored "marbled" spots. The leaves begin to yellow, acquire a grayish-brown hue, curl up, and dry out prematurely.

The presence of fine webbing on the underside of leaves or between stems is a direct and most obvious sign of the presence of a spider mite colony. In advanced cases, the web can cover the entire plant.

Slowed plant growth and loss of leaf turgor indicate that the mite population has reached a critical level. The plant experiences severe physiological stress due to the disruption of photosynthesis.

Visual inspection with a magnifying glass allows for the detection of mobile individuals and pest eggs. Mites often concentrate in the axils of leaves and on young apical shoots.

Prevention starts with maintaining high air humidity in greenhouses, as dryness is the mite's main ally. Regular watering and misting significantly reduce the risk of infestation.

Agrotechnical measures include deep autumn tillage, weed control, and timely removal of plant debris that serves as shelter for the pest during winter.

Upon detection of initial signs, biological control methods are applied, such as the release of entomophages (predatory phytoseiid mites), which effectively control the spider mite population.

Chemical control involves the use of specialized acaricides. It is important to consider that products must act on all stages of mite development, so it is recommended to conduct series of treatments at 5–7 day intervals.

It is necessary to rotate acaricides with different active ingredients to prevent the development of resistance in the pest. Adherence to pre-harvest intervals is an mandatory safety requirement.