Bentazone

Action/Use:

Herbicide

Use: A selective herbicide to control many broadleaf weeds and yellow nutsedge. A postemergence contact spray, so thorough coverage is essential. For control in beans, clover (seed), corn, flax, mint, ornamentals, turf, peanuts, rice, sorghum, soybeans.

Identification

Common Name(s): Bentazone (ISO, BSI, JMAF); ; Bentazon (ANSI, WSSA, CSA); ; Bendioxide (So. Africa)

Chemistry

Properties: Tech: Colorless. Melting point approx. 138�C. Solubility: at 20�C in xylene <1 g/100g; cyclohexanone approx. 18 g/100g.

Mode of Action / Resistance Management

Chemical Group: benzothiadiazinone

Mode of Action: inhibition of photosynthesis at photosystem II

Action Group: HRAC Group C3; WSSA Group 6

Registration

Outside U.S.A.: Galaxy*. Brazil: Doble*.

Environmental Guidelines

Degradation/metabolism: Natural products incorporated into soil organic matter fraction; CO₂. Half-life in soils: average of 13 days under field conditions. Lysimeter studies clearly demonstrate bentazone does not leach

Water Solubility: 500 ppm

Hazards: Fish: LC₅₀ >100 mg/l (rainbow trout). Bee: Nontoxic

Safety Guidelines

Signal Word: CAUTION (Basagran)

Toxicity Class: III

Toxicity: Form. (Rat): Oral LD₅₀ 1860 mg/kg. Dermal LD₅₀ >4000 mg/kg

Handling/storage: Store between 32° and 122°F. Warm to 70°F and agitate until crystals dissolve, or do not use

Spill: Large liquid spillage should be dammed-off and pumped into containers; soak up remainder with absorbent material and dispose of in accordance with local regulations. Solid spillage should be picked up with an industrial vacuum cleaner and disposed of in accordance with local regulations

Product/waste: Must be disposed of by special means, e.g., suitable incineration, in accordance with local regulations

Protective Clothing: Chemical-resistant gloves. Protective eyewear. Chemical-resistant apron when cleaning equipment, mixing, or loading.

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