Garden chafer

The garden chafer (Phyllopertha horticola) is a coleopteran pest belonging to the Scarabaeidae family. It is a well-known beetle that affects a wide variety of plants during its adult stage, while its larvae stage causes hidden damage beneath the soil surface.

This pest infests diverse crops, including fruit trees, roses, strawberries, and various cereals. Adult beetles are primarily folivorous, skeletonizing leaves, while the larvae, commonly known as white grubs, dwell in the soil and feed on the roots of grasses and young crops, causing significant structural stress to the plant root systems.

The biological cycle of the garden chafer usually spans one or two years. Females deposit eggs in grassy or cultivated soils. The resulting larvae overwinter in the soil at various depths. As temperatures rise in spring, they return to the root zone to feed, eventually pupating and emerging as adults in late spring or early summer.

Damage assessment reveals that massive populations can cause total defoliation of fruit trees and significant damage to lawns and turf. The root-feeding activity of larvae often manifests as yellowing, wilting, and patch-like death of crops, which makes it difficult to maintain healthy plant density in affected fields.

To effectively manage populations of Phyllopertha, a multi-faceted approach is required:

• Regular soil cultivation during the pupation stage to disrupt the life cycle.
• Application of specialized insecticides during the peak flight period of adult beetles.
• Use of biological controls like nematodes that target larvae in the soil.
• Maintenance of healthy soil biodiversity to support natural predators.