Symptoms

Very-long-chain fatty acid synthesis (VLCFA)-inhibiting herbicides (herbicide group [HG] 15) cease the production of lipids, resulting in incomplete cell wall formation. Injury symptomology is leaf deformation and draw-stringing where the tip of the leaf is drawn back into the center of the leaf creating a heart-shaped leaflet (Figure 1). The draw-stringing injury can be confused or misidentified as injury from an auxin herbicide. All varieties of soybeans are prone to VLCFA-inhibiting herbicide injury. Draw-string injury can be incurred on established soybean plants if the VLCFA-inhibiting herbicides is applied post residual. Injury is transient and unlikely to cause a yield loss.

Figure 1. Very-long-chain fatty acid synthesis-inhibiting herbicide ‘draw-stringing’ injury on soybeans resulting in a heart-shaped leaflet.

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Figure 1. Very-long-chain fatty acid synthesis-inhibiting herbicide ‘draw-stringing’ injury on soybeans resulting in a heart-shaped leaflet.

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