Exomala

The genus Exomala belongs to the family Scarabaeidae within the order Coleoptera. These beetles are significant agricultural pests in many regions, known for their ability to damage both field and vegetable crops. As members of the scarab family, they share characteristic morphological features such as lamellate antennae and robust bodies.

Exomala species primarily impact crops such as wheat, barley, maize, and various legumes. The larvae, often referred to as white grubs, live underground and feed on roots, causing stunted growth and plant death. Adult beetles are primarily foliage feeders, occasionally causing significant defoliation in various agricultural settings.

The life cycle of Exomala involves complete metamorphosis: egg, larva, pupa, and adult. The larval stage is the most prolonged and destructive period, as these grubs reside in the soil for one or more years. Their development is heavily influenced by soil moisture levels and temperature, with optimal conditions leading to rapid population growth.

Damage is characterized by irregular patches of dying or wilted plants in the field. Root destruction prevents the uptake of water and nutrients, which is particularly devastating during drought conditions. Foliar damage by adults reduces the overall yield potential and can facilitate the transmission of opportunistic pathogens through feeding wounds.

• Crop rotation to break the life cycle of soil-dwelling larvae.
• Deep tillage to expose larvae and pupae to predators and environmental stress.
• Use of soil-applied granular insecticides at planting.
• Seed treatment with systemic insecticides for early-stage protection.
• Monitoring adult beetle flight activity to time potential foliar applications.