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DESCRIPTION:
Large crabgrass, D. sanguinalis, is
a widely distributed annual that germinates throughout the summer. Seedlings
sprout quickly, forming a clump
with extensive roots where soil is moist. Once established, it is difficult
to weed out because it roots at the nodes. To differentiate the flowering stalk
from that of bermudagrass, look for slender
branches arising separately from the stalk. The large crabgrass seedling is
pale green and covered with coarse hairs. It has a membranous ligule and no
auricles with young leaves rolled in the bud. Plants form open clumps up to
2 feet (60 cm) tall. Smooth
crabgrass (D. ischaemum), can be
distinguished from large crabgrass by its shorter, wider leaf, blackish
brown bract and lack of hairs; it is most often found in turfgrass.
See UC IPM's Crabgrass Pest Note
for more
information.
Grass ID illustration.
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