Ochreous chafer

Systematic position. The Ochreous chafer (Amphimallon ochraceus) belongs to the order Coleoptera and the family Scarabaeidae. This beetle is closely related to the European cockchafer and is recognized as a significant soil-dwelling pest that affects both agricultural crops and forest seedlings.

Host plants. This pest is polyphagous, meaning it feeds on a wide range of plants. The larvae (grubs) are particularly destructive to the roots of cereals, grasses, vegetable crops, and young nursery trees. Due to their subterranean nature, they pose a constant threat to the development of root systems in various soil types.

Biology and life cycle. The life cycle of Amphimallon ochraceus spans several years. Adults emerge in late spring to feed on foliage, and females deposit eggs into the soil. The larvae remain underground for several seasons, undergoing multiple molts while consuming root tissues. They eventually pupate in the soil before emerging as new adults.

Damage and economic impact. The primary economic damage is caused by the larvae, which sever plant roots, preventing the uptake of water and nutrients. Infected plants show symptoms of stunted growth, chlorosis, and eventual death. In severe cases, the infestation results in large bare patches in fields, significantly reducing overall yields.

Protection measures. Effective control requires an integrated pest management strategy:

• Performing deep plowing in autumn to expose larvae to birds and harsh weather conditions.
• Implementing crop rotations that disrupt the pest's development cycle.
• Applying granular or liquid soil insecticides during peak infestation periods.
• Introducing biological control agents, such as entomopathogenic nematodes or fungi, into the soil environment.