European chafer

The European chafer (Amphimallon majalis) is a destructive member of the order Coleoptera and the family Scarabaeidae. Originally native to Europe, it has established itself as a major invasive pest in many regions, causing extensive damage to both agricultural crops and managed turfgrass landscapes.

The damage is caused primarily by the larval stage, commonly referred to as white grubs. These larvae feed voraciously on the root systems of grasses, potatoes, strawberries, and various vegetable crops. In agricultural settings, the economic impact is significant due to crop failure and reduced yields in root vegetables and forage crops.

The lifecycle of the European chafer is typically completed within one year. Adults emerge in early summer for mating and egg-laying in the soil. The larvae emerge shortly thereafter, going through three instars while feeding near the soil surface. As temperatures drop in late autumn, they burrow deeper into the soil to overwinter before returning to the surface in the spring to complete their development.

The most visible damage occurs on lawns, where the grass turns brown and can be peeled away like a carpet because the root system has been destroyed. In fields, crop plants may wilt suddenly and die. The presence of these grubs often attracts predators like skunks, crows, and moles, which may cause additional secondary damage to the soil and turf while digging for the larvae.

Management strategies for the European chafer involve a combination of biological and chemical control measures. Effective methods include:

• Application of specialized soil insecticides during peak egg-hatch periods.
• The use of biological control agents such as entomopathogenic nematodes or fungi.
• Proper cultural practices, including maintaining healthy lawn density to tolerate minor feeding.
• Regular soil cultivation where feasible to disrupt larval populations.