Bermuda grass

Bermuda grass (Cynodon dactylon), also known as couch grass, is a perennial grass belonging to the Poaceae family. While it is sometimes used as turf, it is classified as one of the world's most invasive and problematic weeds in agricultural fields, known for its ability to spread rapidly via rhizomes and stolons.

It is widespread in tropical, subtropical, and temperate regions, heavily infesting row crops, orchards, and vineyards. Its ability to thrive in various soil types, ranging from sandy to clay, makes it a persistent challenge in cropping systems where it directly competes for space, sunlight, and soil moisture.

The biology of Bermuda grass is characterized by an extensive underground network of rhizomes that can penetrate deep into the soil profile. Its creeping stems root at the nodes, allowing it to quickly colonize gaps in crop rows. This vegetative reproduction makes mechanical weeding by tilling often counterproductive if rhizome fragments are left in the soil.

Its weediness is defined by extreme competitiveness. By forming dense mats, it stunts crop growth and drastically reduces yields. Furthermore, it often serves as a reservoir for viruses, nematodes, and various insect pests that migrate to the primary crop, leading to additional indirect agricultural losses.

Integrated management is essential. Cultural control involves frequent cultivation in dry conditions to dehydrate rhizomes and the use of competitive cover crops. Chemically, systemic herbicides containing glyphosate or specialized graminicides are applied during periods of active growth to ensure complete translocation of the active ingredient into the root system.