Diploscapter coronatus

Diploscapter coronatus is a microscopic nematode species belonging to the order Rhabditida and the family Rhabditidae. While often considered a soil-dwelling, free-living organism, this species exhibits facultative parasitic behavior, often associating with plant root systems and contributing to the decline of various plant species under stress.

The nematode primarily targets vegetable crops and ornamental plants. It is particularly problematic in greenhouse environments and nurseries, where consistently high soil moisture and warm temperatures provide optimal conditions for the nematode to multiply and infest the roots of vulnerable, young plants.

The biology of Diploscapter coronatus is notable for its ability to reproduce parthenogenetically, which allows for rapid colonization of the substrate. The life cycle consists of several larval stages that can inhabit both the soil and the plant tissues. In adverse environmental conditions, the nematode can enter a specialized survival state known as the dauer stage, allowing it to withstand desiccation.

Damage to plants manifests as stunted root growth, chlorosis, and reduced vigor. By feeding on the epidermal cells of roots, the nematode inflicts physical wounds that serve as entry points for secondary pathogens, such as bacteria and fungi, leading to root rot and significant yield loss if left unmanaged.

Effective management and control strategies include the following:

• maintaining strict crop rotation practices;
• implementing heat or chemical soil disinfestation in greenhouses;
• growing nematode-suppressive cover crops (such as mustard);
• utilizing biological control agents, specifically nematophagous fungi;
• ensuring proper irrigation management to avoid waterlogging the soil.