Adoretus tenuimaculatus

Adoretus tenuimaculatus is a species of beetle belonging to the order Coleoptera and the family Scarabaeidae. Known as a significant agricultural pest, this beetle is recognized for its polyphagous nature and ability to impact a wide variety of ornamental and productive crops in various geographical regions.

The host range of Adoretus tenuimaculatus is diverse, covering numerous plant families. The adults are known to feed extensively on the foliage of grapes, fruit trees such as citrus and stone fruits, as well as several leguminous and ornamental plants. The economic impact is often concentrated on the rapid defoliation of nursery stock and young orchards.

The biology of this pest involves both soil-dwelling and foliage-feeding stages. The larvae develop within the soil profile, primarily feeding on decaying organic matter and roots, while the adults are strictly foliage feeders. Their nocturnal behavior allows them to avoid heat and predators during the day, making manual monitoring and control more challenging.

The damage caused by these beetles is characterized by severe skeletonization of leaves. Adult beetles consume the leaf blade tissue while leaving the veins intact, creating a mesh-like appearance. In cases of high population density, this feeding behavior leads to complete defoliation, which severely reduces plant vigor, photosynthesis, and overall crop production.

Effective management requires an Integrated Pest Management (IPM) approach.

• Deployment of light traps to monitor and reduce adult population numbers during peak activity.
• Soil tillage practices to disrupt larval development in the topsoil.
• Timely application of registered insecticides during the emergence period of adults.
• Maintenance of field hygiene by removing alternative host weeds that support population growth.