Southern spittlebug

Systematic position. The Southern spittlebug, scientifically known as Tomaspis australis, is a member of the order Hemiptera and the family Cercopidae. This insect is classified as a significant sap-sucking pest, primarily affecting various plant species in tropical and subtropical agro-ecosystems where it disrupts plant physiological processes.

Affected crops. This pest is particularly notorious for damaging sugarcane plantations and various grass species in pastures. By targeting the vascular system of these plants, Tomaspis australis can cause widespread losses, particularly in regions where environmental conditions favor its rapid population growth throughout the growing season.

Biology and life cycle. The life cycle involves egg, nymph, and adult stages. Nymphs are distinctively known for producing a frothy, spittle-like mass that covers their bodies. This foam serves as a vital microhabitat, protecting the developing nymphs from desiccation, heat, and predators. Multiple generations per year allow the species to maintain high pressure on crops.

Damage and economic impact. The feeding process involves piercing the plant tissue and extracting xylem sap. This results in severe nutrient deficiency, yellowing of leaves (often called "spittlebug burn"), stunting, and overall yield reduction. In sugarcane, it negatively impacts sugar accumulation, making it a critical pest for the agricultural industry.

Control measures. Managing Tomaspis australis requires a combination of strategies to minimize yield loss.

• Biological control utilizing entomopathogenic fungi such as Metarhizium anisopliae which targets nymphal populations effectively.
• Cultural practices like improved irrigation management and regular harvesting to disrupt the life cycle.
• Monitoring using sticky traps to detect adult emergence.
• Application of systemic insecticides where thresholds are exceeded.