(click images to enlarge)
| Growth regulator herbicides applied postemergence or drift | |||||
 2,4-DB |
 2,4-DB |
 2,4-D |
 2,4-D |
 quinclorac |
 triclopyr |
| Injury from postemergence application of growth regulator herbicides including 2,4-DB (Butyrac® and others), 2,4-D, quinclorac (Facet®/Paramount®), and triclopyr (Garlon®/Rely®) is characterized by twisted stems and leaf petioles, callused stems and malformed leaves that appear strapped, puckered or crinkled. Stems may become brittle, split and show adventitious roots. A plug may form at the base of the plant, weakening the stem. Severe injury will result in yield reduction, particularly when injury occurs during flowering, pod set or pod fill. Injury at this time will result in reduced pod set and development and plants remain green until harvest. | |||||
| Soil applied growth regulator herbicides | |||||
 2,4-D |
 2,4-D |
 picloram |
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Soil applied grwoth regulator herbicides, e.g. 2,4-D used as a burndown, will cause strapped leaves and reduced stands if proper preplant intervals are not followed.
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| Dicamba drift or contamination | |||||
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| Dicamba (Banvel®, Clarity®, Distinct®) drift, spray tank contamination or volatilization (movement of herbicide vapors after application) can cause cupping, crinkling, and strapping and yellowing of the leaf tips. Terminal bud development will stop in severe cases and cause increased branching. Injury from particle drift or spray tank contamination is usually more severe, while injury from volatilization can be more widespread. Yield reduction can occur if soybeans are injured during the reproductive stage and a significant height reduction is noted. | |||||
| Links to state specific information: | |||||||||
| Georgia | Indiana | Missouri | Wisconsin | ||||||