Alfalfa seed weevil

Systematic position: the insect belongs to the order Coleoptera and the family Curculionidae (weevils). It is a highly specialized pest that significantly impacts leguminous seed production.

Host plants: the primary host is alfalfa (Medicago sativa). It poses a severe threat specifically to seed production fields, as it feeds directly on the developing reproductive structures of the plant.

Biology and life cycle: the species completes one generation per year. Adults overwinter in the soil or under crop debris. In spring, they emerge to feed on alfalfa foliage and buds, followed by mating and oviposition within the developing seed pods.

Damage and pest status: the larvae are the primary damaging stage. They feed internally on the developing seeds within the pod, effectively hollowing them out. This results in significant yield loss, reduced seed quality, and poor germination rates in harvested lots.

• Deep fall plowing to disrupt overwintering habitats.
• Spatial isolation of new alfalfa fields from infested old stands.
• Use of early-maturing cultivars to escape peak insect pressure.
• Targeted chemical application during the bud formation stage.

Protection measures: controlling the alfalfa seed weevil requires an integrated approach. Cultural practices like field sanitation and crop rotation are foundational, supplemented by timely insecticide applications based on scouting and threshold levels during the early flowering phase.