Rotylenchus robustus

Rotylenchus robustus is a plant-parasitic nematode belonging to the order Tylenchida and the family Hoplolaimidae. It is widely recognized as a migratory ectoparasite that resides in the soil and feeds on the root systems of a vast array of agricultural and horticultural plants.

This nematode affects a wide range of host plants including vegetables such as carrots and potatoes, soft fruits like strawberries, and various ornamental trees. It is particularly notorious in nursery settings, where it can severely stunt the growth of young saplings and ornamental shrubs.

The biology of Rotylenchus robustus involves a complete life cycle within the soil environment. The nematode passes through an egg stage, four larval stages, and an adult stage. Both larvae and adults use their stomatyle (stylet) to puncture root cells, extracting nutrients and causing physical damage to the plant tissue.

Damage symptoms are often visible in the form of general chlorosis, stunted growth, and a lack of vigor. Below ground, the roots exhibit necrotic lesions and a reduction in the number of root hairs. Because the damage compromises the root system, plants become increasingly susceptible to secondary pathogens and environmental stress.

Management strategies focus on integrated pest management (IPM) to minimize crop losses:

• Implementing crop rotation with non-host species to break the nematode cycle.
• Ensuring the use of certified, nematode-free nursery stock.
• Improving soil health through the addition of organic amendments to stimulate microbial antagonism.
• Applying soil solarization or chemical nematicides in severe infestation cases, following local regulations.