Columbine gall midge

The columbine gall midge (Macrolabis aquilegiae) is a small insect belonging to the order Diptera and the family Cecidomyiidae. This specialist pest targets exclusively plants of the genus Aquilegia, causing distinct developmental abnormalities in its host plants.

The primary host crops are various varieties of columbine. The larvae feed within the leaf and floral tissues, which results in significant aesthetic and physiological damage to the plant. Left unmanaged, the pest can severely degrade the ornamental quality of a flower bed.

Regarding biology, the midge completes several generations during the growing season. Females lay eggs on young, developing leaves or flower buds. The larvae feed inside the tissues, inducing the plant to create galls, which serve as both a food source and a protective environment for the larvae to develop.

Damage is characterized by severe curling, thickening, and discoloration of young foliage. The infested leaves often appear stunted and yellowed. When the midge attacks the buds, they fail to open properly and eventually wither, which causes a substantial reduction in the plant's flowering potential.

Control measures rely heavily on sanitation and chemical intervention. Gardeners should inspect plants regularly and prune away infested buds and leaves to reduce the pest population before larvae pupate. In cases of severe infestations, systemic insecticides can be applied during the active adult flying season to prevent further spread.