See All ProductsMyclobutanil




Controls powdery mildew, dollar spot, brown patch, rusts, and scab on turf, landscape ornamentals, fruit trees, and vines.


Emulsifiable concentrate, wettable powder.


Common Name

Myclobutanil (ANSI, BSI, ISO)

Exp. Code Number

RH-3866 (Rohm & Haas)

CAS Code


Other Code Number

SHA 128857



(RS)-2-(4-chlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)hexanenitrile (IUPAC); α-butyl-α-(4-chlorophenyl)-1H-1,2,4-triazole-1-propanenitrile (CAS)


Light yellow solid. Melting point 63°-68°C. Boiling point 202°-208°C. Stable under normal storage conditions. Soluble in organic solvents such as ketones, esters, alcohols, aromatic hydrocarbons, etc. Insoluble in aliphatic hydrocarbon solvents.

Mode of Action / Resistance Management

Chemical Group


Mode of Action

sterol biosynthesis in membranes

Action Group

FRAC Code 3

Target Site

G1: C14-demethylase in sterol biosynthesis

Risk Note

Medium risk

Environmental Guidelines

Water Solubility

142 ppm at 25°C

Safety Guidelines

Signal Word


Toxicity Class



(Rat): Oral LD50 1600 mg/kg (male); 2290 mg/kg (female). (Rabbit): Dermal LD50 >5000 mg/kg. (Rat): Inhalation LC50 >5 mg/l

Handling/Storage Caution

Store away from excessive heat, sources of ignition and reactive materials. Do not store near food or feed. Do not swallow, get in eyes, on skin, or breathe spray mist. Wash thoroughly after handling and before eating or smoking. Do not contaminate streams, lakes and ponds, feed, or food

Protective Clothing

Long-sleeved shirt and long pants. Chemical-resistant gloves. Protective eyewear.

Emergency Guidelines

First Aid

Get medical aid. Eyes: flush with plenty of water for at least 15 minutes. Skin: wash thoroughly with soap and water. Remove contaminated clothing, wash before reusing. Inhalation: remove to fresh air. If not breathing, give artificial respiration. Ingestion: EC: depending on extent, careful gastic lavage may be indicated because of presence of petroleum hydrocarbons; other formulations: if conscious, give 2 glasses of water.