Green lacewing (in the context of Chrysopa dorsalis)

The Chrysopa dorsalis species belongs to the order Neuroptera and the family Chrysopidae. While many green lacewings are considered beneficial predators, this specific species is associated with particular host plants, often focusing on coniferous environments, where it can act as a significant pest when population levels rise unchecked.

The primary hosts for Chrysopa dorsalis include various species of pines. The insect targets the needles and young shoots of these trees, which serve as both a food source and a site for oviposition. This concentration on young growth makes the pest particularly damaging to nursery stock and ornamental plantations.

The life cycle follows a complete metamorphosis: egg, larva, pupa, and adult. The development rate is highly dependent on ambient temperatures and humidity levels. Typically, the insect undergoes multiple generations throughout the growing season, which explains how populations can escalate quickly in favourable climates.

Damage is characterized by chlorosis, needle distortion, and premature needle drop. The larvae feed on plant tissues, causing significant stress to the host plant. Over time, heavy infestations lead to stunted growth, loss of aesthetic value in ornamental pines, and increased susceptibility to secondary stressors like drought or pathogens.

Integrated pest management (IPM) is the most effective approach for control. Key strategies include:

• Monitoring seasonal activity to predict population spikes;
• Pruning and removing infested branches to reduce local population density;
• Maintaining tree health through proper irrigation and fertilization;
• Applying targeted biological control agents or selective insecticides when economic thresholds are reached.