Lance nematode

Systematic position: Hoplolaimus pararobustus is classified within the phylum Nematoda, order Tylenchida, and family Hoplolaimidae. It is a well-known plant-parasitic nematode characterized by a strong, well-developed stylet, which is the primary tool for puncturing plant cell walls during feeding.

Host range: This nematode is a significant polyphage, meaning it attacks a diverse array of plant species. It is particularly destructive to tropical and subtropical crops, including bananas, plantains, sugarcane, citrus, and various legumes. Its ability to infest a wide variety of plants makes it a major concern for global agricultural systems.

Biology and life cycle: The lifecycle of H. pararobustus consists of an egg stage, four larval stages, and an adult stage. Being a migratory semi-endoparasite, the nematode can penetrate into the root tissue or reside on the root surface. They feed on cortical cells, migrating through the roots and causing extensive internal tissue damage while completing their lifecycle in the soil environment.

Nature of damage and pathogenicity: The damage is primarily mechanical, characterized by the destruction of cortical cells and root necrosis. Infested plants typically exhibit stunted growth, yellowing foliage (chlorosis), and wilting, especially under water stress. Because the nematode compromises the root integrity, it promotes secondary infection by soil fungi and bacteria, leading to further root decay.

Control measures: Management of this pest requires an integrated approach. Essential practices include the use of clean, nematode-free planting material and crop rotation with non-host crops. Enhancing soil fertility through organic amendments can help plants tolerate the damage. In high-value agriculture, the application of chemical nematicides or the use of soil solarization may be necessary to reduce nematode populations in the soil.