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Very-long-chain fatty acid synthesis-inhibiting herbicides ceases 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.

Very-long-chain fatty acid synthesis-inhibiting herbicide injury

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

Author

Extension Weed Specialist and Associate Professor
Crop & Soil Sciences

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Publication date: Jan. 22, 2021

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N.C. Cooperative Extension prohibits discrimination and harassment regardless of age, color, disability, family and marital status, gender identity, national origin, political beliefs, race, religion, sex (including pregnancy), sexual orientation and veteran status.