Aorolaimus helicus

Systematic position: Aorolaimus helicus belongs to the phylum Nematoda, class Chromadorea, order Rhabditida, and the family Hoplolaimidae. It is a specialized migratory ectoparasitic nematode that primarily inhabits the rhizosphere of its host plants.

Biology and life cycle: The life cycle of Aorolaimus helicus involves egg, four larval stages, and the adult stage. The larvae are motile and migrate through the soil in search of suitable host roots. Favorable soil conditions, including sufficient moisture and optimal temperature, significantly accelerate the developmental rate and increase the nematode population density.

Host plants and damage symptoms: This pest affects various agricultural and nursery crops, targeting the root cortex. Using its piercing stylet, the nematode feeds on root cells, causing cellular destruction and lesions. These physical wounds serve as entry points for secondary pathogens like fungi and bacteria, which often accelerate root system decay.

Economic impact: Infestation leads to stunted plant growth, chlorosis, and reduced water and nutrient uptake capacity. The economic damage is characterized by decreased yields and lower plant vigor. In severe cases, particularly in younger plants, root damage can lead to total crop failure due to the plant's inability to survive environmental stress.

Protection measures: Managing Aorolaimus helicus requires a multi-faceted agronomic strategy to minimize crop damage. Recommended practices include:

• Implementing crop rotations with non-host or antagonistic plant species.
• Using high-quality, nematode-free seeds and seedlings.
• Applying biological control agents that target nematode populations in the soil.
• Utilizing soil fumigation or targeted nematicide applications when population thresholds are exceeded.