Cabbage cyst nematode

The cabbage cyst nematode (Heterodera cruciferae) is a microscopic soil-borne parasite belonging to the order Tylenchida and the family Heteroderidae. The female nematode develops into a lemon-shaped cyst, which eventually detaches from the roots and remains in the soil as a protective shell for eggs.

This nematode primarily infests crops within the Brassicaceae family. It poses a significant threat to various cabbage cultivars, including broccoli, cauliflower, Brussels sprouts, radish, turnip, and oilseed rape. Weeds from the same family can also serve as hosts for the pest.

In the spring, larvae emerge from the cysts in response to root exudates from host plants. The life cycle involves the larvae penetrating the roots and developing into mature females. Depending on environmental conditions, the pest can complete one or more generations throughout the growing season.

Infected plants typically show stunted growth, wilting during hot periods, and premature yellowing of the lower foliage. A critical diagnostic feature is the presence of small, white to brown, cyst-like structures visible on the fine root systems when the plant is carefully extracted from the soil.

Management strategies focus on long-term crop rotation cycles of at least 3-4 years without host crops. Other practices include careful sanitation of tools and equipment to prevent moving infested soil, the use of resistant varieties, and soil solarization or the application of specialized nematicides.