Summer chafer

The summer chafer (genus Amphimallon) belongs to the family Scarabaeidae (order Coleoptera). These beetles are recognized as significant pests in agriculture, horticulture, and turf management due to the destructive habits of their larvae, known as white grubs.

The primary economic damage is caused by the larval stage, which resides underground. These grubs consume the roots of grasses, ornamental plants, and various seedlings. This feeding behavior disrupts the uptake of nutrients and water, often leading to the wilting and eventual death of the plant.

The biological development of the summer chafer is protracted, typically spanning one to several years depending on the specific environmental conditions. Adult beetles emerge during the summer, feed on foliage at dusk, and deposit their eggs into the soil, where the larvae will develop through several instars.

Symptoms of an infestation often appear as uneven patches of brown, dying grass or stunted crop growth. A tell-tale sign is the ease with which turf can be pulled up by hand, as the roots have been severed by the feeding grubs beneath the surface.

Management strategies focus on monitoring soil populations and implementing cultural or chemical controls. Key practices include improving soil drainage, encouraging natural predators, and applying targeted soil-applied insecticides or biological control agents like beneficial nematodes or fungi.