Cabbage stem weevil

The cabbage stem weevil (genus Hadroplontus, often referred to as Hadroplontus litura) is a member of the Curculionidae family within the order Coleoptera. It is a recognized pest in agricultural regions where brassicaceous crops are grown, posing a persistent threat to yield stability and quality.

This pest primarily attacks plants belonging to the Brassicaceae family. Key host crops include winter and spring oilseed rape, mustard, and various related vegetables. The pest also thrives on wild cruciferous weeds, which act as primary sources of infestation before moving into commercial agricultural fields.

Regarding its biological cycle, the adult weevil hibernates in soil or plant debris. In the spring, they emerge to feed on plant tissue. The female weevil lays eggs inside the stems or leaf stalks of the host plant. The larvae hatch inside the stem and feed on the internal tissues throughout their development, which often lasts several weeks.

The economic impact of Hadroplontus is significant because the internal feeding of larvae disrupts the vascular system of the plant. This structural damage causes stunted growth, lodging, and increased susceptibility to secondary fungal infections. Heavily infested crops often show poor seed set and reduced oil content, leading to substantial economic losses.

Effective management strategies require a combination of preventative and curative actions. Crop rotation is essential to break the life cycle of the pest. Additionally, chemical control should be timed based on regular field scouting during the spring migration. The use of systemic or contact insecticides remains the standard practice when economic thresholds are exceeded.