Large crabgrass, Digitaria sanquinalis , and smooth crabgrass, Digitaria ischaemum are annuals which persist well under most turf conditions. They are coarse-bladed and light or apple green in color. Crabgrasses are highly competitive in turf and their spreading growth habit tends to minimize recovery by turfgrass species. Crabgrasses can germinate throughout the entire growing season after soil temperatures have warmed in the spring. Germination occurs after each irrigation or rainy period , thus requiring persistent control.
Yellow foxtail is a cool-season annual grass found throughout the United States.
Introduced from Europe, it is most prevalent in thin turfs on rich soils. The stems are erect, branching, and compressed at the base. Leaf blades are flat and medium in width. The sheath is smooth and has a few long hairs at its base. Unlike most other cool-season grasses, yellow foxtail has a ring of hairs for a ligule.