Large Crabgrass

Weeds

hairy crabgrass

Digitaria sanguinalis

Photos

large crabgrass4.jpg

Large crabgrass is a common invader of manicured turf. Large crabgrass has hairs on all surfaces. It can be identified by its light green appearance and swollen, zig-zag nodes. Crabgrass is a summer annual that re-establishes from seed every spring. Crabgrass can be an indication of elevated soil temperatures and will often establish in last year's grub damaged areas.

  • Crops Affected: turf

    Management

    Elevated mowing heights and judicious nitrogen fertilization can be extremely effective at reducing competition from crabgrass. Research studies have shown up to 95% reduction in crabgrass when mowing height is increased from 1.5 to 3.0 inches. Thin turf in the spring or drought conditions often lead to major infestations of crabgrass.

    Similar Species

    Large and smooth crabgrass can be distinguished by the presence (large) or absence (smooth) of hair on the upper and lower leaf surfaces and the stems.

    Look alikes are Giant Foxtail, Green Foxtail, Smooth Crabgrass, and Yellow Foxtail.

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