itchgrass

Cyperales > Poaceae > Rottboellia cochinchinensis (Lour.) W.D. Clayton
Synonym(s): corngrass, raoulgrass

Itchgrass is an annual grass that invades disturbed and agricultural areas throughout the southeastern United States. Stems and leaves are covered with stiff, irritating hairs. Stems can reach a height of 1-10 ft. (0.3-3 m). The inflorescence is a jointed, cylindrical raceme, 1-6 in. (2.5-15.24) long. Under favorable conditions, itchgrass starts producing seeds 6-7 weeks after emergence. Seed production continues throughout the growing season. Leaf blades are 5.9-17.7 in. (15-45 cm) long, 0.2-0.8 in. (5-20 mm) wide and flat. Itchgrass invades agricultural fields and other disturbed areas. The hairs on the stems and leaves can cause severe irritation, and the plant is unpalatable to livestock and wildlife. Itchgrass is native to the Old World tropics, but it is currently widespread throughout the world's tropical regions and in the southeastern United States.


Identification, Biology, Control and Management Resources


Selected Images from Invasive.org

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Plant(s);
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
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Plant(s);
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
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Plant(s);
USDA APHIS PPQ Archive, USDA APHIS PPQ, Bugwood.org
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Fruit(s); Disseminules comprising internode with embedded spikelet and pedicel; far right: disseminule with pedicellate spikelet
Julia Scher, USDA APHIS PPQ, Bugwood.org
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Fruit(s); Caryopses in ventral view (left) and dorsal view (right)
Julia Scher, USDA APHIS PPQ, Bugwood.org
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Fruit(s);
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org
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Invasive Reference(s):

Check Invasive.org for most current lists.
  • Federal Noxious Weed List
  • Arkansas - Noxious Weed Law
  • California - Noxious Weed Law
  • Georgia - EPPC list
  • Massachusetts - Noxious Weed Law
  • Mississippi - Noxious Weed Law
  • North Carolina - Noxious Weed Law
  • Oregon - Noxious Weed Law
  • South Carolina - Noxious Weed Law
  • Texas - Noxious Weed Law
  • Texas - Invasive Plant List
  • Vermont - Noxious Weed Law
  • Invasive Plant Atlas of the Mid-South


External Links


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USDA Forest Service Bugwood University of Georgia