Webbing coneworm

The webbing coneworm (Dioryctria disclusa) is a moth species belonging to the Pyralidae family. It is a significant pest primarily affecting various species of pine trees, causing severe damage to cones and reducing the availability of viable seeds in natural stands and seed orchards.

The host range of this insect includes several species of pine. The damage is exclusively caused by the larval stage, which feeds internally on the cones. The economic impact is felt most strongly in silviculture, as the loss of seeds directly hinders the regeneration of coniferous forests.

The life cycle typically spans one year. The larvae overwinter in hibernacula under bark scales or in other crevices on the tree trunk. As the season warms, they emerge to attack developing cones, creating tunnels and feeding on the internal tissues, which eventually leads to the destruction of the entire cone.

Signs of infestation include the presence of silk webbing mixed with frass on the exterior of the pine cones. These damaged cones often become stunted, discolored, and fall prematurely. Heavy infestations can result in total crop failure within local seed production areas.

• Implementing regular field surveys to detect early signs of webbing.
• Removing and destroying infested cones to lower the pest population.
• Using pheromone-based monitoring to time potential biological treatments.
• Encouraging natural enemies, such as parasitic wasps, to control the moth population naturally.