Pratylenchus delattrei

Pratylenchus delattrei is a nematode species belonging to the order Tylenchida and the family Pratylenchidae. It is a microscopic, obligate parasite that targets the root systems of various agricultural crops.

This species is characterized by a specific stylet structure, which enables the nematode to pierce plant root tissues and feed on the contents of the cells.

Identifying this pest in field conditions is impossible with the naked eye because it lives directly within root tissues and in the rhizosphere soil.

Accurate species identification requires laboratory phytopathological analysis of soil and root samples using microscopy.

Adults and larvae of all stages exhibit a similar parasitic lifestyle, actively invading the roots of the host plant.

This nematode species is highly polyphagous, causing significant damage to cereal crops, such as wheat and barley.

It also infests the roots of certain industrial crops, making Pratylenchus delattrei a significant concern in crop rotation systems.

The primary damage occurs in the root system, where nematodes create tunnels, destroying the root parenchyma.

As a result of these lesions, the plant's ability to absorb water and minerals from the soil is severely impaired.

Weakened plants become more susceptible to fungal and bacterial rots, which often makes correct field diagnosis difficult.

The activity of Pratylenchus delattrei is directly dependent on soil temperature and moisture levels throughout the growing season.

The most intensive nematode reproduction occurs during periods of active root growth in spring and early autumn.

In temperate climates, this pest is capable of completing several generations within a single agricultural season.

Nematodes overwinter as eggs, invasive larvae, or adults within root residues and soil particles.

When unfavorable conditions arise, the nematodes can enter a state of anabiosis, maintaining viability for extended periods.

A common visual sign of infestation is patchy growth retardation and a stunted appearance of plants in the field.

Yellowing and premature death of the lower leaves in cereal crops are characteristic symptoms of infection.

The root systems of affected plants often appear underdeveloped, frequently showing brown necrotic lesions and spots.

In cases of high infestation pressure, a reduction in overall tillering and thinning of the crop stand is observed.

Yields on infested fields decline significantly due to the formation of empty spikes or poorly developed grain.

The most crucial agrotechnical control method is strict adherence to crop rotation, incorporating non-host plant species.

Deep plowing and thorough soil preparation are recommended to reduce the pest population density in the upper soil layers.

Using healthy, certified seeds and resistant crop varieties significantly lowers the risk of mass nematode outbreaks.

The application of chemical nematicides is justified only under conditions of high infestation and must follow official regulations.

• Timely management of weeds, which can serve as alternative hosts for the pest.