Liogenys suturalis

Liogenys suturalis is a destructive soil-dwelling pest belonging to the order Coleoptera and the family Scarabaeidae. This beetle is notably present in South American agricultural landscapes, specifically in Brazil, where it poses a recurring challenge for row crop production due to its larvae's impact on root systems.

The host range of this pest is extensive, affecting major commodity crops. Fields planted with corn, soybeans, wheat, and sorghum are particularly susceptible to infestation. Because the larvae remain underground and feed on roots, the damage often remains unnoticed until the plant shows visible signs of physiological stress.

Regarding its biology, the life cycle of Liogenys suturalis involves a larval stage that acts as the primary destructive force. Adult beetles emerge in the evenings and are often attracted to light, while the larvae develop within the soil profile, moving vertically depending on soil moisture and temperature conditions to optimize their survival and feeding.

The damage caused by this pest is significant, as the larvae consume primary and secondary roots, impairing the plant's ability to uptake water and nutrients. Infected plants exhibit stunted growth, yellowing, and eventual wilting. High larval densities can lead to severe stand thinning, which directly impacts yield potential and economic return on investment.

Integrated pest management strategies are recommended:

• Treating seeds with systemic insecticides to protect early root development.
• Monitoring adult beetle populations using light traps during the flight period.
• Applying soil-incorporated insecticides at the time of planting in high-risk areas.
• Implementing appropriate crop rotation to break the pest's life cycle.
• Utilizing biological control agents, such as entomopathogenic fungi or nematodes, to reduce larval soil populations.