Cactus nematode

Cactodera weissi is a specific species of phytoparasitic nematode belonging to the family Heteroderidae, order Tylenchida. This pest specializes in attacking members of the Cactaceae family, causing stunted plant growth and severe damage to the root system.

In both natural habitats and greenhouse cultivation, the nematode affects a wide range of cactus species. Most damage occurs in greenhouses and specialized collections, where the pest can spread rapidly through contaminated substrate, tools, or already infested succulent specimens.

The life cycle of Cactodera weissi includes a cyst stage, where larvae can remain viable in the soil for several years while awaiting favorable conditions. Upon sensing the roots of a host plant, the larvae become active, penetrate the root tissues, and begin feeding, causing pathological changes in the plant's cellular structure.

A characteristic sign of infestation is the appearance of specific structures on the roots — females that turn into dense brown cysts, which are visible to the naked eye. Externally, this manifests as a cessation of cactus growth, stem yellowing, wilting, and general loss of turgor, as the nematodes deprive the plant of access to nutrients and water.

• Disinfection of substrate and pots before planting.
• Using only healthy planting material.
• Application of specialized systemic nematicides.
• Observing quarantine measures for new plants.
• Regular inspection of the root system during repotting.

Effective protection against Cactodera weissi relies on preventive measures, as treating a heavily infested plant is extremely difficult. If cysts are detected, it is necessary to isolate the specimen, replace the substrate, and if necessary, treat the root system with chemical agents approved for use in closed environments.