Bright-line brown-eye

The bright-line brown-eye (Latin: Lacanobia oleracea) is a destructive polyphagous insect belonging to the Noctuidae family, order Lepidoptera. This moth is recognized as a significant agricultural pest, affecting a wide range of horticultural and field crops globally.

This species is highly adaptable and targets various plants including cabbage, tomatoes, sugar beet, peas, and potatoes. Its ability to feed on many wild weed species ensures that the population can persist throughout the growing season even in the absence of primary commercial crops.

The life cycle involves complete metamorphosis, consisting of the egg, larva (caterpillar), pupa, and adult moth stages. The insect overwinters as a pupa within the soil. Adult moths emerge in the spring to lay eggs in clusters on the underside of leaves, and depending on the climate, there may be one or two generations per year.

The larvae are responsible for the damage. Early instars cause leaf skeletonization, while later instars consume large parts of the foliage. In cabbages and other headed vegetables, the larvae bore into the core, causing severe damage, contamination with frass, and promoting secondary bacterial rot, rendering the crop unmarketable.

Effective management requires an integrated pest management approach. Cultural controls include autumn plowing to disturb pupae and consistent weed management. Chemical control relies on the timely application of insecticides during the early larval stages when they are most vulnerable, often guided by monitoring pheromone traps.