Hickory shoot curculio

The Conotrachelus aratus, commonly known as the hickory shoot curculio, is a species of snout beetle belonging to the family Curculionidae (order Coleoptera). It is primarily recognized as a specialized pest that affects trees within the genus Carya, particularly hickory and pecan trees, significantly impacting their growth.

This pest is destructive mainly because of its feeding habits. Adult beetles feed on the succulent shoots, while the larvae bore into the stems and new growth. This activity creates internal tunnels that weaken the structure of the branches, frequently causing them to wilt, die, or break off during windy conditions.

The life cycle of the hickory shoot curculio consists of the egg, larval, pupal, and adult stages. Females typically deposit their eggs at the base of buds or on young shoots. Once the larvae hatch, they immediately burrow into the tissue to feed. After completing their larval stage, they drop to the ground to pupate in the soil before emerging as adults.

The primary symptom of infestation is the characteristic flagging or drooping of current-season shoots. In heavy infestations, this can significantly reduce the overall foliage density and fruit production potential of the tree. Monitoring for these symptoms is essential for effective management during the peak growth months of spring and summer.

Effective control strategies require an integrated pest management approach. Mechanical control involves pruning and destroying infested shoots to eliminate larvae before they exit to the soil. Chemical control is often applied during the period of adult emergence. Maintaining tree health through proper fertilization and irrigation also helps the plants tolerate minor infestation pressure.