Dallisgrass

Dallisgrass (Paspalum dilatatum) is a productive perennial forage grass belonging to the family Poaceae. It is highly valued for its ability to provide high-quality forage during the summer months, particularly in regions with warm or subtropical climates, where other cool-season grasses may suffer from heat stress.

Originating in South America, this grass has become naturalized in many parts of the world, including the United States, Australia, and Mediterranean Europe. It has established itself as a staple component in pastures, praised for its aggressive growth habit, persistence under grazing pressure, and high nutritional value for livestock.

Botanically, Dallisgrass is a bunch-type grass that forms deep, robust root systems and clumps with spreading stems. The foliage consists of long, flat leaves that grow from a dense crown. The inflorescence is unique, consisting of several racemes arranged along a central axis, typically drooping slightly as the seeds mature.

The agronomic management of Dallisgrass requires fertile, moist soils, although it exhibits a moderate level of drought tolerance once established. It thrives in temperatures between 20°C and 30°C. Management practices include:

• Regular nitrogen fertilization to boost biomass production
• Controlled grazing to prevent stem elongation and maintain leaf quality
• Monitoring soil moisture levels in drought-prone areas

While Dallisgrass is excellent for grazing, it is susceptible to ergot (Claviceps paspali), a fungal infection that develops in the seed heads and can be toxic to cattle and horses if ingested in large quantities. Effective pasture management, such as timely mowing before seed maturation, is essential to mitigate these risks and ensure the health of livestock.