Australian plague locust

The Austracris guttulosa, commonly referred to as the Australian plague locust, belongs to the family Acrididae within the order Orthoptera. This species is recognized as a significant agricultural pest, known for its sporadic but devastating outbreaks that can threaten food security across vast regions of Australia.

This insect is a polyphagous feeder, meaning it attacks a wide variety of plant species. Primary crops at risk include cereals like wheat, barley, and sorghum, alongside high-value pasture grasses and horticultural crops. During severe infestations, locusts do not discriminate, consuming almost any green plant tissue available in their path.

The biology of this species is complex, involving phases of both solitary and gregarious behavior. The life cycle consists of three distinct stages: egg, nymph, and adult. Eggs are typically laid in moist soil within egg pods. Under favorable climatic conditions, particularly after rainfall, the populations can increase exponentially, leading to the formation of dense, migrating swarms.

Damage caused by this pest is primarily characterized by rapid defoliation. Nymphs and adults strip leaves, stems, and flower heads from plants, often leading to total crop failure. The sheer biomass of a locust swarm means that the damage occurs almost instantly, leaving farmers with very little time to implement reactive mitigation strategies.

Control measures require a proactive approach focused on early detection through professional monitoring programs. Management strategies include the strategic use of contact and systemic insecticides applied primarily during the nymphal stages. Additionally, landscape management and monitoring soil moisture levels help predict potential outbreaks, allowing for timely intervention before the insects reach the mobile adult stage.