Peanut root-knot nematode

Meloidogyne arenaria belongs to the phylum Nematoda, class Chromadorea, order Tylenchida, and family Meloidogynidae. It is considered one of the most destructive endoparasitic root-knot nematodes, possessing a broad host range and causing significant economic losses in global agriculture.

This pest infests a vast number of plant species, including vegetable, cucurbit, fruit, and industrial crops. Highly susceptible hosts include peanuts, tomatoes, cucumbers, peppers, eggplants, and various weed species that serve as reservoirs for the nematode in the soil.

The life cycle of the nematode includes egg, four larval stages, and adult stages. Females develop within root tissues, where they induce the formation of characteristic swellings known as galls. The optimal conditions for their development and reproduction include high soil moisture and temperatures between 25 and 30 degrees Celsius.

The primary symptom of infestation is the formation of numerous knots or galls on the root system. The nematode's feeding disrupts the plant's vascular system, hindering the transport of water and nutrients, which leads to chlorosis, stunted growth, reduced yields, and, in severe cases, the death of the plant.

Management strategies require an integrated approach: implementing crop rotation with antagonistic crops, using resistant cultivars, applying thermal soil disinfestation in greenhouse environments, and utilizing specialized nematicides. Phytosanitary inspection of planting material is crucial to prevent the spread of the pathogen.