Australian lawn beetle

Systematic position: Autoserica insanabilis belongs to the order Coleoptera and the family Scarabaeidae. Commonly referred to as the Australian lawn beetle, it is a significant pest within the subfamily Melolonthinae, widely recognized for its impact on managed landscapes and agricultural areas.

Host plants: This beetle is a highly polyphagous pest. It primarily targets turfgrasses, pastures, and various ornamental plants. The larvae are notorious for feeding on the root systems, which can also affect the growth of young vegetables and nursery-grown plants when the larval population density is high.

Biology and life cycle: The lifecycle of Autoserica insanabilis consists of egg, larval, pupal, and adult stages. Adults are nocturnal, showing high activity during warm evenings. Females oviposit directly into the soil. The larvae, which are typical scarab white grubs, develop through several instars within the soil profile, where they spend most of their existence.

Character of damage and economic importance: The larval stage is responsible for the economic damage. By consuming plant roots, they disrupt nutrient and water uptake. On lawns, the damage typically manifests as large, necrotic patches of turf that can be easily peeled back from the soil like a carpet, as the root system has been completely severed.

Control measures: Management requires a combination of chemical and biological strategies.

• Application of soil-applied insecticides containing chlorantraniliprole or imidacloprid for larvae control.
• Utilization of entomopathogenic nematodes (such as Heterorhabditis or Steinernema species) to suppress larval numbers.
• Implementation of light traps to monitor and reduce adult beetle populations during peak flight periods.
• Maintaining optimal turf health through proper irrigation and aeration to assist in recovery.