Tropical crabgrass

Tropical crabgrass, known scientifically as Digitaria bicornis, is an annual grass species belonging to the Poaceae family. While it is not traditionally classified as a commercial crop, it plays a significant role in tropical agricultural ecosystems, primarily as a widespread and aggressive weed that affects various arable fields.

This species is native to tropical and subtropical regions across the globe. It is highly invasive in many parts of the Americas, Africa, and Asia, often colonizing disturbed habitats such as crop fields, orchards, and roadsides. Its success is attributed to its high level of phenotypic plasticity, which allows it to thrive in diverse environmental conditions.

Botanically, Digitaria bicornis is defined by its prostrate or ascending stems that tend to root at the nodes. The leaf blades are flat and typically scabrous, providing a rough texture. The inflorescence consists of several racemes arranged in a digit-like fashion, from which the plant derives its common and scientific naming, reflecting its unique floral morphology.

The plant demonstrates a preference for sunny, open areas with well-drained soils, although it shows remarkable tolerance to soil moisture fluctuations. It thrives in hot, humid climates where temperatures remain consistently high. Because it is highly sensitive to shading, canopy management in crop fields is an effective strategy for suppressing its growth.

From an agricultural standpoint, it is primarily treated as a pest that competes with maize, soybeans, and other row crops for light, nutrients, and soil moisture. Management is challenging due to the large amount of seeds produced, which remain viable in the soil for extended periods. Integrated weed management, including mechanical cultivation and chemical control, is essential for maintaining crop yields in infested areas.

• High seed production capacity
• Fast germination rates
• Deep-reaching fibrous root system
• Significant economic impact on row crop yields