Citrus needle nematode

Neodolichodorus citri is a species of plant-parasitic nematode belonging to the order Tylenchida and the family Dolichodoridae. This microscopic roundworm is a significant soil-borne pest that specifically targets the root systems of various plants, with a strong preference for citrus species.

The primary hosts for this nematode include economically important citrus crops such as lemons, oranges, and grapefruit. The organism persists in the soil profile, utilizing its specialized stylet to puncture and feed on the cells of root tips and peripheral tissues, causing extensive damage to the plant's ability to absorb water and nutrients.

The life cycle of Neodolichodorus citri is intimately linked to the growth phases of its host. Development from juvenile stages to reproductive adults occurs primarily within the rhizosphere. The population dynamics are heavily influenced by soil moisture, temperature, and the abundance of host roots, allowing the nematode to complete multiple generations under favorable conditions.

The economic impact of this pest is characterized by stunted plant growth, chlorosis, reduced fruit size, and significant yield losses. Infested roots often display signs of necrosis and structural degradation. Severe infestations can lead to a general decline in the tree's health, making it more susceptible to secondary infections and environmental stress.

Management strategies focus on integrated pest management (IPM). Key practices include:

• Utilizing nematode-free, certified nursery stock to prevent spread.
• Maintaining soil health through organic amendments to encourage natural antagonists.
• Implementing proper irrigation scheduling to minimize environmental stress on the trees.
• Using resistant rootstocks where available.
• Applying nematicides only when economic threshold levels are exceeded.