Herbicide Injury: Group 2 Herbicides* (Acetolactase Synthase (ALS)) injury on Soybeans

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ALS injury - reddish veins on the underside of the soybean leaf (red-to-purple veins on the lower veins on the lower side of the leaf). Some ALS herbicides may also cause yellow leaf margin, crinkled leaves, yellowing near growing point, stunting and death of the growing point.*Groups 2 Herbicides include Accent, Arsenal, Classic, Elim EP, FirstRate, Muster, Pinnacle, Peak, Prism, Pursuit, Refine Extra, Reliance STS, Telar, Ultim, Upbeet. Many co-pack or combination herbicides also contain Group 2 Herbicides. See Table 3 Herbicides Groupings for Ontario in Publication 75 Guide to Weed Control.