Nathrius

Systematic position: Nathrius (Nathrius brevipennis) belongs to the family of longhorn beetles (Cerambycidae) in the order Coleoptera. This small beetle is a specialized wood-boring insect that inhabits the cavities of woody stems, branches, and dried vines. Despite its small size, the insect can cause significant damage to weakened plant populations.

Host plants: This pest primarily affects grapevines, as well as various stone and pome fruit crops. It poses a particular threat to young seedlings in nurseries and to weakened shrubs that have been subjected to mechanical injuries or adverse environmental conditions.

Biology and life cycle: The life cycle of Nathrius is closely linked to the condition of the wood. Females lay their eggs directly under the bark or in wood crevices. Upon hatching, the larvae penetrate deep into the plant tissues, creating winding tunnels while feeding on the cambium and sapwood. Larval development occurs over one season, after which the larvae pupate inside the wood before emerging as adults.

Nature of damage: The primary damage is caused by the larval stage. As the larvae feed, they disrupt the sap flow in plant tissues, leading to premature drying of branches, crop loss, and even the death of plant sections. When the population density is high, the infested wood becomes extremely brittle and prone to breaking under wind pressure.

• Regular sanitary pruning and immediate removal of infested branches.
• Timely disposal (burning) of pruned wood to eliminate the breeding grounds of the pest.
• Ensuring optimal water and mineral nutrition to strengthen plant immunity.
• Application of insecticide treatments during the adult flight period to prevent egg-laying.