Lance nematode

Systematic position and pathogen type: Hoplolaimus indicus belongs to the phylum Nematoda, class Chromadorea, and family Hoplolaimidae. It is a well-known plant-parasitic nematode that predominantly inhabits the soil and feeds on the root systems of various agricultural plants.

Diseases and crops: This nematode is a broad-spectrum polyphage, causing significant damage to major staple crops such as rice, wheat, corn, and sugarcane. It also affects vegetable crops and various horticultural plants, inducing stunted growth, reduced root proliferation, and lower overall crop yield quality.

Biology and life cycle: The life cycle of Hoplolaimus indicus consists of egg, four larval stages, and the adult phase. As semi-endoparasites, they use a robust stylet to puncture and feed on cortical cells of the roots. This feeding process results in the destruction of plant tissues and may cause characteristic lesions that lead to root rot symptoms.

Conditions for development and spread: These nematodes thrive in well-aerated, moist soil conditions with warm temperatures. Their dissemination occurs primarily through contaminated soil, infected nursery stocks, and irrigation water, allowing them to establish populations across various agricultural ecosystems rapidly.

Harmfulness and control measures: Due to direct root damage, plants exhibit nutrient deficiency symptoms and vulnerability to environmental stress. Effective management requires an integrated approach:

• Implementation of crop rotation schemes to break the nematode life cycle.
• Application of soil amendments to improve plant root resistance.
• Use of biological control agents, such as nematophagous fungi or bacteria.
• Application of chemical soil fumigants or nematicides in severe infestation scenarios.