Oklahoma State University Stillwater, OK | |
Oklahoma Alfalfa |
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Redroot Pigweed |
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COMMON NAME: | Redroot Pigweed |
SCIENTIFIC NAME: | Amaranthus retroflexus L. |
TYPE: | Summer Annual Broadleaf |
DESCRIPTION | |
Germination: | April-September. |
Reproduction: | By seed, July-October. |
Stems: | Erect, stout, branched, often red at base. |
Leaves: | Simple, alternate, long-petioled, hairs on underside. |
Flowers/ Inflorescence: |
Terminal panicle of several crowded stout spikes. Eight inches long and up to two inches wide, very stiff bracts up to 1/4 inch long. |
Fruit: | Small black seeds, 1/32 inch diameter. |
FOUND: |
Statewide, but mostly eastern counties. |
CONTROL: |
Can be controlled in newly spring planted alfalfa and in thinning stands with BUTYRAC 200 and PURSUIT. |
In Alfalfa | Plant |
Leaf |
Plant |
Seed Head |
Additional Redroot Pigweed Images |
Jim Stritzke Former Alfalfa Weed Control Specialist Department of Plant and Soil Sciences Oklahoma State University |