Pale chafer

Systematic position. The Pale chafer (Amphimallon pallens) is a beetle belonging to the family Scarabaeidae within the order Coleoptera. This species is recognized as a significant soil pest in many European agricultural regions, with its larval stage causing the most substantial impact on plant health.

Host plants. The species is highly polyphagous. Its larvae infest a wide range of agricultural crops, including cereals, sugar beets, potatoes, and vegetable seedlings. Furthermore, they are often found damaging the roots of perennial grasses and nursery stock, which can lead to severe economic losses in both field crops and forestry.

Biology and life cycle. The development cycle of this beetle typically spans two to three years. Adult females oviposit in the soil, favoring sites with sufficient organic matter. After hatching, the larvae reside in the soil profile, moving vertically in response to moisture and temperature changes, and go through several instars before finally pupating.

Damage and pest status. The damage is exclusively caused by the C-shaped larvae, commonly known as white grubs. They feed voraciously on the root systems of host plants, leading to severe root pruning. This disruption prevents the plant from absorbing necessary water and nutrients, eventually causing wilting, chlorosis, and total plant death.

Control measures. Integrated pest management (IPM) is essential for control. Effective cultural practices include systematic deep tillage to expose larvae to avian predators and desiccation. Chemical control involves the application of soil-incorporated insecticides at the time of planting or through targeted irrigation. Biological control options, such as entomopathogenic fungi or nematodes, are increasingly used to suppress larval populations.