False root-knot nematode

Pathogen and disease type
The false root-knot nematode (Nacobbus aberrans) is a highly damaging endoparasitic nematode that causes a severe phytoparasitic disease. Unlike sedentary endoparasites, it penetrates deep into the root cortex, creating characteristic gall-like structures that disrupt the plant's vascular system and nutrient uptake.

Affected crops
This pest has a broad host range, posing a significant threat to agriculture. Primary crops affected include sugar beet and sweet pepper, as well as potatoes, tomatoes, and various cruciferous species. It can also persist in the roots of many common weed species found in agricultural fields.

Symptoms and signs of infestation
Symptoms are often manifested as stunted plant growth, yellowish foliage (chlorosis), and wilting during dry periods. The hallmark sign of Nacobbus aberrans is the formation of elongated, bead-like galls on the roots, which differentiate it from the rounded galls produced by other common root-knot nematode species.

Conditions for development and severity
The nematode thrives in well-aerated soils under warm climatic conditions, typically favoring temperatures between 20°C and 25°C. Its severity is characterized by massive damage to the root system, leading to a significant loss of harvest volume and quality, and in severe cases, the complete loss of the crop.

Control and prevention measures

• Implement long-term crop rotation cycles, avoiding host crops for several consecutive seasons.
• Use certified nematode-free planting stock and clean greenhouse substrates.
• Strict control of weed populations that serve as alternative hosts.
• Application of biological nematicides or fungi that act as antagonists to the nematode population.
• Deep tillage and soil solarization or chemical fumigation in high-value vegetable production.