Peanut nematode

The peanut nematode (Aphelenchoides arachidis) is a significant plant-parasitic nematode belonging to the order Tylenchida and the family Aphelenchoididae. It is primarily known for causing severe damage to peanut crops, acting as a major limiting factor in production areas where environmental conditions favor its development.

The primary host for this nematode is the peanut plant (Arachis hypogaea). Unlike many soil-borne nematodes that primarily attack root systems, this species is highly specialized to infest pods and seeds, making it a difficult pathogen to manage through conventional soil treatments alone.

Regarding its biology, Aphelenchoides arachidis completes its life cycle within the host tissues. It survives effectively in infested seeds and dried plant debris. This ability to persist in dormant stages allows the nematode to be transmitted over long distances through infested agricultural products, leading to the rapid spread of the parasite.

Damage symptoms are often visible in the form of stunted plant growth, chlorosis, and reduced pod development. The most severe economic impact arises from the direct damage to the kernels inside the pods, which show discoloration and shriveling, leading to reduced yield and significantly lower market value of the crop.

Effective management strategies include the following:

• Utilizing only certified nematode-free seeds for planting.
• Implementing strict quarantine measures for seed movement.
• Applying recommended nematicides in heavily infested soils.
• Maintaining long-term crop rotation with non-host plant species.
• Ensuring thorough destruction or deep incorporation of crop residues into the soil after harvest.