Brown lacewing

The brown lacewing (Boriomyia subnebulosa) belongs to the order Neuroptera and the family Hemerobiidae. While many family members are known as beneficial predators, specific species like Boriomyia subnebulosa can cause concern in agricultural settings due to their complex interactions with various host plants.

This species primarily inhabits trees and shrubs. The larvae feed on aphids and scale insects, but they can occasionally disturb plant physiology when searching for prey or nesting sites. The presence of these insects is often linked to the general health and density of the local insect population in orchards.

The life cycle involves complete metamorphosis, consisting of eggs, three larval instars, pupae, and adults. Depending on the climatic zone, the insect typically produces several generations per year. Overwintering occurs in sheltered areas, such as bark crevices or dense foliage, where they remain in a dormant state.

Damage caused by this insect is primarily indirect. Mechanical irritation of tender shoots during the developmental stages can lead to stunted growth or leaf curling. In professional nurseries, the damage is often exacerbated if the plants are already under stress from environmental factors or nutrient deficiencies.

Effective management strategies rely on cultural and chemical methods. Maintaining orchard hygiene, including the removal of debris and old bark, is crucial for reducing overwintering sites. Integrated Pest Management (IPM) should prioritize these cultural practices, utilizing selective insecticides only when population numbers threaten crop productivity.