Black scarab beetle

Systematic position: Alissonotum piceum belongs to the order Coleoptera, the family Scarabaeidae, and the subfamily Dynastinae. It is widely recognized as a serious agricultural pest, particularly in the regions where sugarcane cultivation is a major economic activity, such as Asia.

Crops damaged: The primary host for this beetle is sugarcane. However, the larvae are polyphagous to some extent and can cause damage to the roots of various grasses and other monocotyledonous crops found in agricultural landscapes, which often complicates field management.

Biology and life cycle: The insect undergoes a complete metamorphosis. Adults are nocturnal and strongly attracted to light, which is often used in monitoring their population levels. Females lay eggs in moist, nutrient-rich soils, where larvae emerge and feed on subterranean plant parts throughout their developmental stages.

Character of damage: The damage is primarily caused by the larval stage, which feeds on the roots of host plants. By destroying the root system, the larvae impede the plant's ability to uptake water and nutrients, which results in stunted growth, yellowing foliage, lodging of stalks, and significant yield loss across infested fields.

Protection measures: Integrated Pest Management (IPM) is essential for controlling this beetle effectively:

• Deep plowing or mechanical tilling to disturb the larvae in the soil profile.
• Deployment of light traps during the adult emergence phase to reduce the breeding population.
• Application of granular or systemic insecticides during the planting stage to protect the root zone.
• Crop rotation with non-host species to break the pest life cycle and reduce larval density in the soil.