Thorne’s lesion nematode

Pratylenchus thornei is a migratory endoparasitic nematode belonging to the order Tylenchida and the family Pratylenchidae. This soil-borne pathogen is recognized globally as a significant threat to agricultural productivity, causing extensive root damage through its feeding behavior.

The nematode has a wide host range, primarily affecting cereal crops such as wheat, barley, and oats. In addition to cereals, it frequently infects legumes like chickpeas, lentils, and various vegetable crops, making it a difficult pest to manage in diverse cropping systems where suitable hosts are always present.

The life cycle of this organism involves both juvenile and adult stages, all of which are capable of infesting root tissues. As they move within the root cortex, they consume cells, creating lesions that facilitate secondary infections by soil-borne fungal pathogens, thereby exacerbating the overall damage to the plant.

Damage symptoms often mimic nutrient deficiencies or drought stress because the compromised root system cannot effectively take up water and minerals. Infected plants typically exhibit stunting, chlorosis, and reduced tillering, which directly correlates to significant yield losses in wheat and other susceptible small grains.

Management strategies focus on integrated pest management practices. Key approaches include:

• Utilizing resistant or tolerant crop varieties.
• Implementing long-term crop rotation with non-host crops.
• Maintaining soil fertility to help plants compensate for root loss.
• Controlling weeds that act as alternate hosts.
• Applying nematicides where economically justified by high soil population densities.