Alfalfa seed weevil

Systematic position: The pest belongs to the order Coleoptera and the family Apionidae. Apion neofallax is a specialized weevil species that focuses its life cycle on the reproductive parts of specific legume plants, particularly alfalfa.

Crops damaged: The primary host plant is alfalfa (Medicago sativa). While the weevil shows a strong preference for cultivated alfalfa, it can also survive on various wild legume species growing in field margins or nearby uncultivated areas, which serve as reservoirs for future infestations.

Biology and life cycle: The adult weevils overwinter in the soil or under debris. During the spring, they emerge and begin feeding on young leaves and developing buds. Females deposit eggs directly into the buds or immature pods. The larvae emerge inside the pods and complete their entire development by feeding on the maturing seeds.

Nature of damage and economic importance: The damage is primarily caused by larvae, which consume the seed contents, leading to hollowed-out seeds and reduced seed yield. Adults also cause minor damage by feeding on foliage, but the main economic impact is the severe loss of viable seed, which is critical for alfalfa production systems.

Control measures: Integrated pest management includes cultural practices such as timely harvesting to destroy larvae within pods before they exit. Crop rotation and maintaining clean field borders help reduce population density. In cases of high infestation, insecticide applications during the bud and early flowering stages are recommended to manage the adult population before egg-laying occurs.