Cypress weevil

Cylindrocopturus deleoni is a species of weevil belonging to the family Curculionidae. This insect is recognized as a specific pest that primarily targets trees and shrubs within the Cupressaceae family. Its presence is a significant concern for arborists and gardeners focused on maintaining the health and aesthetic value of coniferous landscapes.

The host plants mainly include various species of cypress and juniper. The larvae are the primary cause of damage, as they feed on the inner bark and cambium layers of the host. This feeding activity disrupts the vascular system of the tree, hindering the transport of water and nutrients, which eventually leads to branch dieback.

The life cycle follows a complete metamorphosis: egg, larva, pupa, and adult. Adult weevils are typically active during the warmer months. After mating, females deposit eggs into crevices of the bark or into pits specifically gnawed for this purpose. Larvae bore into the bark, creating extensive galleries that remain active for several months.

Signs of infestation include the wilting and browning of individual branches, the presence of small exit holes in the bark, and noticeable resin bleeding at the site of larval activity. In severe cases, the damage is extensive enough to compromise the structural integrity and vitality of the tree, making it prone to opportunistic secondary pathogens.

Management and control strategies include:

• Monitoring for early symptoms of infestation during the growing season.
• Pruning and destroying infested branches to reduce the pest population density.
• Applying systemic insecticides that can reach the larvae hidden beneath the bark.
• Maintaining tree vigor through proper irrigation and fertilization to help them resist pest attacks.