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Peak

Syngenta · Sulfur 57.0% · EPA Reg 100-763 · Insecticide Document last checked 2026-05-30

About this product

Active ingredient Sulfur 57.0%
Manufacturer Syngenta
Category Insecticide

Full details for Peak

Source product label ↗ Open the catalog source label while the local copy is reviewed. Verify the product name, EPA registration number, and revision before use. Source safety data sheet ↗ Open the catalog source SDS while the local copy is reviewed. Verify the exact product and revision before relying on it. EPA registration data Reg. 100-763 — registry reference, signal word and status.

Applicator discussion

Nothing here is label direction — the label is the law. These are notes from other applicators, moderated before they appear. Check the labeling accompanying the product and applicable state requirements.

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According to the label From the product label

These details were extracted from this product's label PDF. The label is the law. Confirm every rate, site, restriction and safety requirement against the label before mixing or applying. Check for a state supplemental label; a product may be restricted or prohibited in a state or site even when a rate appears below. · EPA registration data for Reg. 100-763 →

Peak is a selective herbicide containing 57.0% Prosulfuron. It is formulated as a water-dispersible granule designed for weed control in various small grain crops, including barley, field corn, sorghum, oats, proso millet, rye, triticale, wheat, and following small grain harvest. The product is applied postemergence to control broadleaf weeds. When using this product, handlers must wear specific personal protective equipment (PPE), including long-sleeved shirts, long pants, and waterproof gloves made of barrier laminate, butyl rubber, nitrile, neoprene, natural rubber, polyethylene, polyvinyl chloride (PVC), or Viton (all ≥ 14 mils), as well as shoes plus socks. It is important to avoid contact with eyes, skin, or clothing, and to avoid breathing spray mist. This product has a high potential for leaching into groundwater and can impact surface water quality through runoff; users should avoid application near water or in areas with shallow groundwater. A restricted-entry interval (REI) of 12 hours applies to treated areas.

Pests covered (1)
broadleaf weeds
Areas treatable (1)
barley, field corn, sorghum, oats, proso millet, rye, triticale, wheat, and following small grain harvest

Application instructions from the label 1

barley, field corn, sorghum, oats, proso millet, rye, triticale, wheat, and following small grain harvest

Postemergence application; weed control is optimum when soil moisture exists and weeds are actively growing.

Target pest
broadleaf weeds
Location
Outdoor

Mixing instructions 1

Finished strength Label notes
water-dispersible granule formulation which must be thoroughly mixed in water and applied as a spray Must be thoroughly mixed in water.

Worker safety

Re-entry interval (REI) 12
PPE required Long-sleeved shirt and long pants; Waterproof gloves (barrier laminate, butyl rubber, nitrile, neoprene, natural rubber, polyethylene, PVC, or Viton ≥ 14 mils); Shoes plus socks.

Timing & weather

Use restrictions 2