The dipyridiniums exhibit foliar activity only. Sulfonylureas Key performance features. The aromatic amino acid inhibitors Accent, Beacon, Ally, Harmony, Pinnacle, Peak, Amber and Finesse are applied postemergence. Glean is applied either pre-emergence or postemergence. Accent, Beacon and Pinnacle control a few annual grasses and many broadleaf species, while Ally, Harmony, Peak, Amber and Finesse control many broadleaf species.
Sunlight plays a minor role in sulfonylurea losses.
If the active ingredient stay unprotected on the soil surface, a relatively small portion of the herbicide may be lost due to ultraviolet degradation. Water and soil pH is very important. Sulfonylurea activity is largely determined by soil clay and organic matter. Greater clay and organic matter require a higher dose. Sulfonylureas exhibit a wide range in crop and weed sensitivities.