Lucerne flower midge

The lucerne flower midge (Dasineura lupulini) is a specialized insect pest belonging to the order Diptera and the family Cecidomyiidae. It primarily affects alfalfa crops, focusing its destructive activity on the reproductive structures of the plant, which makes it a major concern for seed production.

The primary damage is caused by the larvae, which develop inside the flower buds of the alfalfa. By feeding on the internal organs of the bud, the larvae prevent proper flower development, leading to deformation and subsequent bud drop. This direct damage drastically reduces the plant's ability to produce seeds.

The life cycle of Dasineura lupulini is closely linked to the phenology of alfalfa. Adult midges emerge in synchrony with the bud development stage. Females lay eggs directly into the developing flowers. The larvae undergo their development inside the bud before either pupating within the remains of the flower or dropping into the soil.

The economic impact of the lucerne flower midge can be severe, especially in seed-growing regions. Heavy infestations lead to a total failure of seed set in affected flowers. In favorable weather conditions, several generations per season can significantly deplete the reproductive potential of an entire field.

• Crop rotation to break the midge's life cycle.
• Early cutting of the alfalfa crop for hay or silage to remove larvae before they mature.
• Application of selective insecticides during the peak flight period of adults.
• Deep plowing of the soil after harvest to bury pupae and prevent emergence.
• Use of natural biological control agents and parasitoids where possible.