Root-knot nematode Meloidogyne vandervegtei

Meloidogyne vandervegtei is a microscopic phytoparasitic worm of the order Tylenchida, family Meloidogynidae. This species is an obligate parasite that lives in the soil and within the plant root system.

Adult females of this species have a characteristic pear-shaped body, common to the entire Meloidogyne genus. They are sedentary and lead an endoparasitic life inside the root tissue of the host plant.

Second-stage juveniles (J2) are the only invasive stage capable of actively moving through soil moisture to search for the roots of a suitable host plant.

Identification of this specific species in practice is difficult due to its morphological similarity to other members of the genus; therefore, molecular genetic analysis (PCR) or study of the female's perineal pattern is required for accurate determination.

The spread of this pest occurs primarily through contaminated soil, agricultural tools, and planting material that has not undergone phytosanitary inspection.

This species of nematode specializes in infecting a wide range of agricultural crops, often found in tropical and subtropical agroecosystems.

Meloidogyne vandervegtei causes the most serious damage to vegetable crops, such as tomatoes, cucumbers, peppers, and eggplants, leading to a significant reduction in marketable yield.

Besides vegetables, the pest can infect certain ornamental plants and industrial crops, making it a dangerous polyphage for intensive farming systems.

Parasitization of the roots by the nematode disrupts normal water and nutrient uptake, causing stunted growth of the entire plant.

In cases of heavy infestation, premature wilting and plant death are observed, especially during periods of drought or high temperatures when the root system cannot cope with supplying moisture to the aerial parts.

The main sign of infection is the formation of specific swellings — galls — on plant roots, which form in response to the secretion of enzymes by the nematode.

Aerial symptoms include leaf chlorosis, stunted growth, dwarfism, and reduced flowering, which are often mistakenly attributed to fertilizer deficiencies.

Upon examination of the root system, one can notice the presence of thickenings of various sizes, inside which are female nematodes surrounded by egg sacs.

The root system of infested plants often looks deformed, with a lack of fine absorbing rootlets, leading to weak anchorage of the root in the soil.

In neglected cases, infested roots are susceptible to secondary fungal and bacterial infections, which accelerate the rotting process and complete death of the root system.

The basis of control is crop rotation using nematode-resistant cultivars, which allows for the natural reduction of the pest population in the soil.

Using high-quality healthy planting material and pathogen-free substrates in protected cultivation significantly reduces the risk of initial infection.

Agrotechnical methods include disinfecting agricultural tools, removing plant residues with roots, and deep plowing, which contributes to the death of larvae under UV exposure.

Biological control methods include the use of predatory fungi and antagonistic bacteria that suppress nematode development in the rhizosphere.

Chemical protection involves the application of specialized nematicides before sowing, although this method requires strict adherence to environmental regulations and safety protocols.