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Dr. John M. Young

Pediatrician in Amarillo, Texas

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Johnson Grass

Johnson Grass • Sorghum halepense

Grasses

Conditions: Allergic rhinitis; allergic asthma; allergic conjunctivitis.

Symptoms: Itchy, stuffy, or runny nose; post-nasal drip; sneezing; itchy, red or watery eyes; asthmatic symptoms.

Physical description: Grows between 2-7 feet tall, long, broadleaf blades; flower head is large, open, well-branched, dark reddish, or purplish-brown.

Environmental factors: Very common; found in fields, crops (usually corn), roadsides, and sandy, rugged areas; reproduces by seeds; grass pollen grains travel hundreds of miles.

Cross-reactivity: Bahia grass; figs; maize pollen; melons; oranges; tomatoes.

Pollination Area

Included species: Andropogon halepensis, holcus halepensis, sorghum miliaceum.

References

  1. “Johnsongrass (Sorghum halepense).”Weed Gallery: Johnsongrass–UC IPM. http://ipm.ucanr.edu/PMG/WEEDS/johnsongrass.html
  2. “Plants – Johnsongrass (Sorghum halepense).”
    National Invasive Species Information Center. https://www.invasivespeciesinfo.gov/plants/johnsongrass.shtml
  3. “Johnsongrass.”Merriam-Webster. https://www.merriam-webster.com/dictionary/johnsongrass

Did You Know?

Johnson grass was brought to the United States in the 1800s as a forage crop. Today it is considered among the world’s 10 worst weeds because of its invasive nature.

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Dr. John M Young, MD

1500 S Coulter Street, Suite 3
Amarillo, Texas 79106
(806) 354-0404 Extension 3330

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