See All ProductsBromoxynil




A selective, postemergence, contact herbicide. Has little soil activity. For control in barley, field corn, popcorn, flax, garlic, mint, oats, onions, rye, seedling alfalfa, sorghum, triticale, wheat, forage grasses, grass for sod and seed protection, and alfalfa in CRP.


Emulsifiable concentrate, water-soluble powder.


Common Name

Bromoxynil (ANSI, ISO, BSI, WSSA)

Trivial Names

bromoxynil heptanoate; bromoxynil octanoate

Exp. Code Number

M&B 10064 (Rhone-Poulenc)

CAS Codes

1689-84-5 (Phenol); 1689-99-2 (Octanoate); 56634-95-8 (Heptanoate)

Other Code Number

SHA 035301 (Octanoate)



Phenol: 3,5-dibromo-4-hydroxybenzonitrile; Octanoate: 2,6-dibromo-4-cyanophenyl octanoate (IUPAC)


Phenol: White odorless solid. Melting point 194°-195°C. Octanoate: Clear, amber waxy solid, characteristic odor. Melting point 45°-46°C. Vapor pressure 0.1 mm/Hg (20°C). Readily hydrolized to bromoxynil at pH >9. Solubility: Pure, 25°C: acetone 170 g/l; methanol 90 g/l. Octanoate, 20°-25°C: acetone, ethanol 100 g/l; benzene, xylene 700 g/l; chloroform, dichloromethane 800 g/l; cyclohexanone 550 g/l.

Mode of Action / Resistance Management

Chemical Group


Mode of Action

inhibition of photosynthesis at photosystem II

Action Group

HRAC Group C3; WSSA Group 6

Environmental Guidelines


Pure: Fish: LC50 0.05 mg/l (rainbow trout). Bee: Nontoxic

Water Solubility

13,000 ppm

Safety Guidelines

Signal Word


Toxicity Class



Tech (Rat): Oral LD50 160 mg/kg; Dermal >2000 mg/kg. (Rabbit): Dermal 3660 mg/kg; mild skin, eye irritation. Form (octanoate) (Rat): Oral LD50 365 mg/kg; Dermal >2000 mg/kg. (Rabbit): Dermal 1675 mg/kg. 

Handling/Storage Caution

Handle carefully. Avoid contact with fish and wildlife. Do not use or store near heat or open flame. Store at temperatures above 3°F. If allowed to freeze, remix before using. Do not contaminate water, food, or feed by storage or disposal of this chemical  

Protective Clothing

Chemical-resistant apron when cleaning equipment, mixing, or loading. Long-sleeved shirt and long pants. Chemical-resistant gloves. Shoes plus socks.

Emergency Guidelines

Fire Extenguishing Media

Carbon dioxide or dry chemical for small fires. Water spray or alcohol-type foam for large fires

First Aid

Get medical aid. Eyes: hold lids open and flush with a steady, gentle stream of water for at least 15 minutes. Skin: immediately wash with plenty of soap and water, if available, while removing contaminated clothing and shoes. Ingestion: induce vomiting unless aromatic solvent present. Inhalation: remove to fresh air. Give artificial respiration or administer oxygen if needed