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Oklahoma State University Stillwater, OK |
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Oklahoma Alfalfa |
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Oklahoma State University Stillwater, OK |
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Oklahoma Alfalfa |
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Johnsongrass |
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| COMMON NAME: | Johnsongrass |
| SCIENTIFIC NAME: | Sorghum halepense (L.) Schrad. |
| TYPE: | Perennial Warm-season Weedy Grass |
| DESCRIPTION | |
| Germination: | May to July. |
| Reproduction: | By large rhizomes and seeds. |
| Stems: | Erect, stout, from 1 1/2 to 6 feet tall. |
| Leaves: | Eight to 24 inches long, 1/2 to 1 1/2 inches wide. No hairs on blade or sheath, some on ligule. |
| Flowers/ Inflorescence: |
An open panicle with numerous whorled branches. Spikelets 2-flowered, 1 fertile and sessile, the other pedicelled and not producing seed. |
| Fruit: | Seed unit often hulled caryopsis, dark reddish brown. |
FOUND: |
Johnsongrass is primarily found in cropped areas, along roadsides, and other non-grazed areas. It can also be a problem in alfalfa. |
CONTROL: |
Johnsongrass is usually a problem in spots, so it is best to spot treat with POAST PLUS or SELECT with retreating to gain effective control. It can be treated as late as September. Some seeding control of Johnsongrass is possible in spring planted alfalfa with EPTAM. |
In Alfalfa |
 Plant |
Leaf | Plant | Seed Head |
Additional Johnsongrass Images |
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| Jim Stritzke Former Alfalfa Weed Control Specialist Department of Plant and Soil Sciences Oklahoma State University |
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