Mesotrione

Action/Use:

Herbicide

Use: A synthetic relative of natural herbicides produced by the plant Callistemon citrinus. For use on field corn, seed corn, sweet corn, yellow popcorn, and grain sorghum.

Identification

Common Name(s): Mesotrione (BSI, ISOPA)

Chemistry

Class: Callistemone.

Formula: C₁₄H₁₃NO₇S.

Properties: Beige to tan liquid with a faint pleasant odor.

Mode of Action / Resistance Management

Chemical Group: Triketone

Mode of Action: Bleaching inhibition of 4-hydroxyphenyl-pyruvate-dioxygenase (4-HPPD)

Action Group: HRAC Group F2; WSSA Group 27

Registration

Outside U.S.A.: Registered in Europe.

Environmental Guidelines

Hazards: Fish: LC₅₀ (96 h) >120 mg/l (bluegill sunfish, rainbow trout). Bird: Oral LD₅₀ >2000 (bobwhite quail); >5200 mg/kg (mallard duck)

Water Solubility: 15,000 ppm

Soil Particle Adsorption: Not persistent in soil. Stable in water. Moderately mobility in soil

Safety Guidelines

Signal Word: CAUTION

Toxicity Class: III

Toxicity: (Rat): Oral LD₅₀ >5000 mg/kg. Dermal LD₅₀ >2000 mg/kg. Inhalation LC₅₀ >5 mg/l

Handling/storage Cautions: Can be stored as low as 20°F

Spill Control/cleanup: Control spill at its source and contain to prevent from spreading, contaminating soil, or entering sewage and drainage systems or any body of water. Clean up immediately. Solid; Sweep up material and place in compatible disposal container. Liquid: Cover entire spill with absorbing material and place into compatible disposal container. Scrub area with hard water detergent. Pick up wash liquid with additional absorbent and place in container. Seal container and arrange disposition

Product/waste Disposal: Do not reuse product containers. Dispose of product containers, waste containers, and residues according to local, state, and federal health and environmental regulations

Protective Clothing: Long-sleeved shirt and long pants. Chemical-resistant gloves. Shoes plus socks.

Suppliers and Branded Products

Basic Producers:

Beta Chemicals Ltd.

FJ Agrochemicals Co., Ltd.

Gilmore Marketing & Development, Inc.

Hamlung Chemicals Co., Ltd.

Jiangyin Milagro Chemical

Max (Rudong) Chemicals Co., Ltd.

Shenzhen Yancheng Chemicals Co., Ltd.

Syngenta (Callisto*, Tenacity*)

Formulators' Trade Names: