Aphids suck plant juices but are controlled by Diazinon dust or sprays of rotenone or Sevin.
Columbine skipper larva is a greenish caterpillar with a black head that eats and rolls the leaves. This insect is controlled by Sevin.
Columbine borer attacks in May and bores down the stem to the roots. Work the soil thoroughly in spring to destroy the eggs. No chemical control is listed.
Columbine leaf miner causes winding white trails in the leaves. Dispose of the infested leaves and plant residues in the fall. No chemical control is listed.