Brown lacewing

The brown lacewing, scientifically classified as Boriomyia concinnus, belongs to the order Neuroptera and the family Hemerobiidae. While many members of this family are recognized as beneficial predators of aphids and mites, Boriomyia concinnus exhibits unique ecological behaviors that can occasionally lead to damage in specific plantation environments.

This species primarily targets coniferous trees, including various species of spruce, pine, and fir. It thrives in temperate forest zones and nurseries where young conifer saplings provide an abundant substrate for both feeding and reproduction. The pest prefers young, succulent needles and developing buds during the active growing season.

The biological cycle of Boriomyia concinnus follows a complete metamorphosis: egg, larva, pupa, and adult. The larval stage is particularly destructive, as it actively consumes plant tissues when its typical prey populations are insufficient. Understanding the phenology of this insect is crucial for timing any necessary control interventions effectively.

The damage caused by this insect involves tissue necrosis, stunted shoot development, and the loss of foliage density. In heavy infestations, the cumulative stress on the tree can make it susceptible to bark beetles or fungal infections, significantly compromising the vigor of the forest stand or ornamental planting.

Effective management and protection strategies for nurseries and gardens include:

• Establishing a monitoring program to detect adult activity using light traps.
• Applying systemic or contact insecticides when larval density exceeds established thresholds.
• Promoting natural predator habitats to control secondary pest outbreaks.
• Implementing regular pruning of damaged or infested branches to reduce local population pressure.