Locusta migratoria manilensis

Locusta migratoria manilensis, known as the Oriental migratory locust, is a subspecies of the migratory locust found across East and Southeast Asia. It is one of the most destructive agricultural pests in the region, capable of forming massive swarms that can devastate rice paddies, corn fields, and other crops over vast areas.

Swarms form through a biological process called phase polyphenism, where individual locusts transform from a solitary phase to a gregarious phase when population density increases due to favorable breeding conditions. In the gregarious phase, the locusts change color, become highly social, and begin migrating in coordinated swarms that can contain millions of individuals.

Locusta migratoria manilensis primarily affects countries in East and Southeast Asia, including China, the Philippines, Indonesia, Vietnam, and Thailand. China has historically suffered some of the most devastating locust plagues attributed to this subspecies, and maintains large-scale monitoring and control programs.

Control methods include chemical pesticide spraying, biological control agents such as the fungus Metarhizium acridum, and ecological approaches like modifying habitat to reduce breeding sites. Early warning systems and regional cooperation are critical because swarms can cross national borders rapidly.