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Crop Protection Database

Hexazinone

Action/Use:

Herbicide

Use: A foliar or soil applied herbicide with soil activity. Controls woody plants in reforestation areas (site preparation or conifer release); selective weed control in alfalfa (except Velpar* DF), blueberries, conifers, pineapple, rubber trees, sugarcane (except Velpar*, Velpar L*).

Identification

Common Name(s): Hexazinone (ANSI, ISO, BSI, WSSA)

Chemistry

Properties: White, crystalline solid. Melting point 115�-117�C. Soluble in chloroform 388 g/100g; methanol 265 g/100g; benzene 94 g/100g; dimethylformamide 83.6 g/100g; acetone 79.2 g/100g; toluene 38.6 g/100g; sparingly soluble in hexane 0.3 g/100g.

Mode of Action / Resistance Management

Chemical Group: Triazinone

Mode of Action: Inhibition of photosynthesis at photosystem II

Action Group: HRAC Group C1; WSSA Group 5

Environmental Guidelines

Hazards: Fish: LC₅₀ 320-420 mg/l (96 h) (rainbow trout); 274 mg/l (minnow); 370-420 mg/l (sunfish). Bee: Nontoxic

Water Solubility: 33,000 ppm

Safety Guidelines

Signal Word: DANGER (eye)

Toxicity Class: I

Toxicity: (Rat): Oral LD₅₀ 860 mg/kg. Dermal LD₅₀ 5278 mg/kg. Corrosive, causes irreversible eye damage.

Handling/storage Cautions: Store above 32°F

Protective Clothing: Long-sleeved shirt and long pants. Shoes plus socks. Protective eyewear.

Suppliers and Branded Products

Formulators' Trade Names:

Helena Chemical Co. (Velossa*)

Pro-Serve, Inc. (Pronone* Power Pellet)

B.V. Industrie- & Handelsonderneming Simonis (Wopro-hexazinone*)

Villa Crop Protection (Hexsan*, Villex*)

Willowood Ltd. (Trend*)

Premix Products:

+ Diuron

Hexaron* — Makhteshim Agan Group, Milenia Agrociencias S.A., Proficol
Velpar* AlfaMax* — DuPont Crop Protection
Velpar* AlfaMax* Gold — DuPont Crop Protection

+ Sulfometuron-methyl

Oustar* — DuPont Crop Protection
Westar* — DuPont Crop Protection

Discontinued Names:

Velpar* K-4*

Velpar* ULW

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