Cyhalofop-butyl 
Action/Use:
- Herbicide
Use:
Controls postemergence grass weeds in rice.
Identification
Common Name(s): Cyhalofop-butyl (ANSI, ISOPA)
Chemistry
Formula: C20H20FNO4.
Properties: White crystalline solid. 20°C: in acetonitrile, acetone, dichloroethane, methanol all >250 g/l; n-heptane 6 g/l; n-octanol 16 g/l.
Mode of Action / Resistance Management
Chemical Group: Aryloxyphenoxy-propionate
Mode of Action: Inhibition of acetyl CoA carboxylase (ACCase)
Action Group: HRAC Group A; WSSA Group 1
Registration
Outside U.S.A.: Claron* for use in Argentina.
Environmental Guidelines
Hazards: Fish: LC50 1.54 mg/l (Japanese carp), 1.65 mg/l (rainbow trout). Bird: LD50 >5620 mg/kg (bobwhite quail, mallard duck). Dietary LC50 >2250 ppm (bobwhite quail, mallard duck). Earthworm: LD50 >1000 mg/kg. Bee: >100 µg/bee (NOEC for honeybee)
Water Solubility: 0.44 mg/l (unbuffered), 0.46 mg/l (pH 5), 0.44 mg/l (pH 7) (all at 20°C)
Safety Guidelines
Toxicity: (Rat): Oral LD50 >5000 mg/kg; Dermal LD50 >2000 mg/kg. Inhalation LC50 >5.63 mg/l
Handling/storage: Discard clothing and other absorbent materials that have been drenched or heavily contaminated with product concentrate. Do not use or store near heat or open flame. Do not contaminate water, food or feed by storage and disposal.
Product/waste: Dispose of wastes on site according to label directions or at an approved waste disposal facility. Triple rinse container then recycle or dispose in sanitary landfill
Protective Clothing: Coveralls over long-sleeved shirt and long pants. Chemical-resistant gloves. Chemical-resistant footwear plus socks. Protective eyewear.
Suppliers and Branded Products
Basic Producers:
Dow AgroSciences LLC (Clincher*)
Fertiagro Pte. Ltd. (Beauty*)
IPESA S.A. (Claron*)
Wangs Crop-Science Co., Ltd. (Bendas*)
Formulators' Trade Names:
Premix Products:
+ Penoxsulam
- Clinton* — BMC Group Co., Ltd.
- RebelEX* — Dow AgroSciences LLC
