Spruce cone moth

The spruce cone moth (Barbara herrichiana) is a destructive pest belonging to the order Lepidoptera, family Tortricidae. It is widely recognized in forestry for its significant negative impact on the seed yield of spruce trees, often causing severe economic losses in seed orchards.

This moth primarily targets spruce species. The pest prefers healthy, cone-bearing trees, where larvae develop by feeding on the internal tissues of the developing cones, which ultimately destroys the future seed crop.

The biological cycle consists of a single generation per year. Adult moths emerge during late spring. Females lay their eggs on the scales of young, developing cones. Upon hatching, the larvae immediately bore into the cone to begin their feeding cycle.

The damage caused by the larvae is characterized by the internal excavation of the cone axis and seeds. Affected cones usually turn brown, stop growing, and may dry out prematurely. The presence of resin mixed with larval excrement, known as frass, on the exterior of the cone is a key indicator of infestation.

Effective management requires a combination of strategies. Chemical control is most successful when applied during the period when neonate larvae are moving from the egg to the cone surface. Additionally, silvicultural practices, such as removing infested cones, can help reduce the local population density for the following season.