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Species
Information
- johnsongrass
- Sorghum
halepense (L.)
Pers.
- USDA
Symbol: SOHA
- Oregon
Noxious Weed Designation: B
- Pictures
Identification:
Perennial; grows 2 to 8 ft tall. Leaf blades flat with a prominent white midvein. Scaly, finger-think rhizomes produced from the crown.
Impacts:
Johnsongrass is one of the world’s 10 worst weeds. It is extremely competitive and a serious weed in corn production. Newer herbicides have reduced its impact in many crops but significant efforts are still directed at controlling this plant. It has been reported that livestock grazing on large amounts of young Johnsongrass are at risk of HYDROGEN CYANIDE POISONING. Johnsongrass is an alternate host to corn leaf gall, maize dwarf mosaic, wheat streak mosaic, and beet yellows viruses; it also harbors sorghum midge, an insect pest of cultivated sorghum.
Biological
Controls: No approved biocontrol agent is available.
Oregon
Maps of Johnsongrass Distribution
Links:
USDA
Plants Database information on
Johnsongrass
GRIN
Database information on
Johnsongrass
Oregon Department
of Agriculture information on Johnsongrass
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