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University of Illinois Extension serving Christian, Jersey, Macoupin and Montgomery Counties

Main Office (Montgomery County)
#1 Industrial Park Dr.
Hillsboro, IL 62049
Phone: 217-532-3941
FAX: 217-532-3944
Email: uie-cjmm@illinois.edu
Hours: Monday - Friday 8 am to 12 pm, 1 pm to 4:30 pm

Branch Office (Christian County)
1120 N Webster St.
Taylorville, IL 62568
Phone: 217-287-7246
FAX: 217-287-7248
Hours: Monday - Friday 8am to 11:30am, 12:30pm to 4.30pm

Branch Office (Jersey County)
201 W. Exchange St.
Suite A
Jerseyville, IL 62052
Phone: 618-498-2913
FAX: 618-498-5913
Hours: Tuesday & Wednesday 8 am to 12 pm and 1 pm to 4:30 pm and Thursday 8 am to 12 pm

Branch Office (Macoupin County)
#60 Carlinville Plaza
Carlinville, IL 62626
Phone: 217-854-9604
FAX: 217-854-7804
Hours: Monday - Thursday 8 am to 12 pm; 1 pm to 4:30 pm

News Release

Palmer amaranth and non-crop environments

Source: Aaron Hager, 217-333-4424, hager@illinois.edu

News writer: Stephanie Henry, 217-244-1183, slhenry@illinois.edu

URBANA, Ill. - Palmer amaranth (Amaranthus palmeri) has garnered much attention recently in both academic discussions and popular press releases, and with good reason, says University of Illinois weed scientist, Aaron Hager.

Among the weedy species of Amaranthus, Palmer amaranth has the fastest growth rate and is the most competitive with the crops common to Midwest agronomic cropping systems, Hager explains. Soybean yield losses approaching 80 percent and corn yield losses exceeding 90 percent have been reported in the peer-reviewed scientific literature.

“While most concern focuses on Palmer amaranth in agronomic cropping systems, keep in mind that Palmer amaranth also can become established in non-crop areas,” Hager cautions.  “Palmer amaranth populations in non-crop environments obviously do not compete with agronomic crops, but these established plants can produce seeds that ultimately find their way into crop production fields.”

Hager said that crop scientists recently verified the identification of a Palmer amaranth population growing in an area enrolled in the Pollinator Habitat Initiative of the Conservation Reserve Program. The origin of this population remains unknown, but some speculate the forb seed mixture purchased to sow the pollinator area might have been contaminated with Palmer amaranth seed. 

“Regardless of how and where a Palmer amaranth population becomes established, it remains critically important to take all appropriate steps to prevent established Palmer amaranth plants from producing seed,” Hager says. “We strongly encourage all who have established pollinator habitats with a purchased forb seed mixture to scout these areas as soon as possible. 

“If Palmer amaranth is identified, please take steps to remove these plants before viable seeds are produced on the female plants. Plants should be severed at or below the soil surface and carried out of the field. Severed plants can root at the stem if left on the soil surface, and plants can regenerate from stems severed above the soil surface,” he says.

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Local Contact: Gary Letterly, Extension Educator, Energy and Environmental Stewardship, letterly@illinois.edu