Cabbage stem weevil

The cabbage stem weevil (Glocianus punctiger) is a significant agricultural pest belonging to the family Curculionidae (order Coleoptera). This insect is recognized for its specialized feeding habits on plants within the Brassicaceae family, making it a major concern for growers of oilseed rape and various cabbage crops.

The primary host range for this pest includes crops such as broccoli, cauliflower, cabbage, Brussels sprouts, oilseed rape, and mustard. The weevil is particularly attracted to young, developing plants where the tender tissues are easily accessible for egg-laying and larval feeding.

Regarding its biology, the insect completes one generation per year. Adult weevils overwinter in the soil or protected areas under crop debris. As temperatures rise in early spring, they migrate to host plants. The female punctures the leaf tissue to deposit eggs, leading to the development of larvae inside the stems or leaf petioles.

The damage caused by Glocianus punctiger is twofold: adults create small puncture wounds on foliage, while the larvae feed internally within the stems. This internal feeding disrupts nutrient transport, often resulting in stunted plant growth, wilting, structural weakness, and in severe cases, the complete collapse of the plant.

• Implementing crop rotation sequences that include non-host crops to break the life cycle.
• Eliminating cruciferous weeds that serve as alternative hosts during the off-season.
• Practicing autumn tillage to destroy pupae residing in the soil profile.
• Monitoring adult activity with traps and applying targeted insecticides when economic thresholds are reached.