Transcaucasian chafer

The Transcaucasian chafer (Amphimallon gravis) is a beetle belonging to the order Coleoptera and the family Scarabaeidae. It is recognized as a significant soil-dwelling pest that poses a substantial threat to agricultural productivity in various regions.

This pest affects a broad range of host plants, including major grain crops, vegetable crops, and ornamental nurseries. The larvae are known for their voracious appetite, feeding primarily on the root systems of young plants, which can devastate entire crops if the infestation density is high.

The life cycle of this insect usually spans from two to three years. Adults emerge in spring or early summer to feed on foliage before mating. Females subsequently deposit eggs into the soil. The larvae, which are C-shaped and creamy white, go through three instars, remaining underground where they feed on roots throughout the growing season.

The damage caused by the larvae is characterized by root pruning and destruction, which prevents the plant from absorbing necessary water and nutrients. Infected fields often display patches of stunted, wilting, or dead plants. This damage is particularly critical during the early stages of plant growth, often leading to significant reductions in yield.

Management strategies focus on reducing larval populations through integrated practices:

• Tillage practices such as deep plowing to expose larvae to natural predators or desiccation.
• Application of granular or systemic soil insecticides during the planting phase.
• Utilization of biological control agents, including entomopathogenic nematodes or fungi.
• Implementing crop rotation to disrupt the insect's life cycle.