Oklahoma State University
Stillwater, OK

Oklahoma Alfalfa
Oklahoma Cooperative Extension Service
Oklahoma Agricultural Experiment Station

Tall Waterhemp

COMMON NAME: Tall Waterhemp
SCIENTIFIC NAME: Amaranthus tuberculatus (Moq.) J.D. Sauer
TYPE: Summer Annual Broadleaf
DESCRIPTION                                                                    
    Germination: April-September.
    Reproduction: By seed, July-October.
    Stems: Erect, slender to 3 feet tall, green or red (female plants usually red).
    Leaves: Narrow ovate to lanceolate, glabrous (no hair or fuzz).
Flower/
Inflorescence:
Terminal spike, simple to highly branched, male and female plants, very short bracts.
  Fruit: Seed reddish to black, less than 1/32 inch in diameter.

FOUND:

Central and eastern counties in spring planted alfalfa and in thinning stands.

CONTROL:

Can be controlled in newly spring planted alfalfa and thinning stands with BUTYRAC 200 and PURSUIT.  PURSUIT resistant plants have been reported, so be aware of that.
In Alfalfa tn_tallwathemp-479_jpg.jpg (1645 bytes)
Plant
tn_tallwathemp480_jpg.jpg (1996 bytes)
Leaf
tn_twaterhemp-22_jpg.jpg (1651 bytes)
Plant
tn_twhmp-019_jpg.jpg (1287 bytes)
Seed Head
Additional Tall Waterhemp Images
Jim Stritzke
Former Alfalfa Weed Control Specialist
Department of Plant and Soil Sciences
Oklahoma State University

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