Rimsulfuron

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Rimsulfuron

中文通用名

砜嘧磺隆

IUPAC

1-(4,6-dimethoxypyrimidin-2-yl)-3-(3-ethylsulfonyl-2-pyridylsulfonyl)urea

CAS

N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2-pyridinesulfonamide

CAS No.

122931-48-0

Molecular Formula

C₁₄H₁₇N₅O₇S₂

Molecular Structure

General Product Information

Category

Herbicides > Sulfonylurea Herbicides

Activity

Herbicide

Rimsulfuron is absorbed by the foliage of treated plants and translocated to the meristem. The site of action is acetolactate synthase (ALS), an enzyme in branched chain amino acid biosynthesis. The initial metabolic pathway for rimsulfuron in maize initially involves hydroxylation on the pyrimidine ring followed by glucose conjugation.

The optimum time for application varies. Generally, annual weeds require early post-emergence treatments (between two and five leaves) with annual grasses requiring treatment before tillering. Perennial weeds should be treated when taller and may benefit from sequential treatments. Adjuvants are essential for consistent weed control. A second application at up to the 6-8 leaf stage of maize is advised for the control of summer weeds. Post-emergence applications are most effective in tomatoes.

In field trials, rimsulfuron generally showed equal or better weed control than standard treatments at very much lower application rates.

Studies conducted from 19920 to 1995, showed that rimsulfuron alone gave 100% control of wild radish, 68-70% control of corn spurry and 75-90% control of narrowleaf goldenrod. The control level for corn spurry was found to be elevated when rimsulfuron was used in combination with metribuzin.

Field trials conducted in 2005 in Ontario, Canada showed that when rimsulfuron was applied post-emergically to field corn, it provided little visual control of wirestem muhly.

CropUse

CropUses:
maize, potatoes, tomatoes

Maize	15 g ai/ha
Potatoes	10-35 g ai/ha

Premix

Thifensulfuron-methyl+rimsulfuron
Rimsulfuron+metribuzin
Rimsulfuron+Mesotrione+Fluroxypyr-meptyl
Rimsulfuron+Mesotrione
Rimsulfuron+Haloxyfop-P-methyl
Rimsulfuron+chlorimuron-ethyl+mesotrione
Nicosulfuron+rimsulfuron
Nicosulfuron+atrazine+rimsulfuron
Metribuzin+Clethodim+Rimsulfuron
Dry flowable. Premix Parters: acifluorfen bentazone;

Type	AI concⁿ
Water-dispersible granule (WG)	25% (w/w)

Physical & Safety Data

Physical Properties

Molecular weight:431.4g/mol; Physical form:Colourless crystals. Density:0.784 (25℃); Composition:Tech. is 99%. Melting point:176-178℃; Vapour pressure:1.5 ×SYM> 10-3 mPa (25℃); Partition coefficient(n-octanol and water):logP = 0.288 (pH 5), -1.47 ( pH 7) (25℃); pKa:4.0; Solubility:In water (25℃) <10 mg/l (unbuffered); 7.3 g/l (buffered, pH 7).; Stability:On hydrolysis (25℃),DT50 4.6 d (pH 5), 7.2 d (pH 7), 0.3 d ( pH 9).;

Toxicology

Oral:Acute oral LD₅₀ for rats >5000 mg/kg. Percutaneous:Acute percutaneous LD₅₀ for rabbits >2000 mg/kg. Non-irritating to skin; moderately irritating to eyes (rabbits). Non-sensitising to skin (guinea pigs). Inhalation:LC₅₀ (4 h) for rats >5.4 mg/l air. ADI:(EPA) 0.125 mg/kg.

Environmental Profile

Ecotoxicology:
Bees:LD₅₀ (contact) >100 mg/bee; (dietary) >1000 ppm.Fish: (96 h) LC₅₀ >1000 mg/l (bluegill, rainbow trout). Birds:Acute oral LD₅₀ for bobwhite quail >2250, mallard ducks >2000 mg/kg. Dietary LC₅₀ for bobwhite quail and mallard ducks >5620 ppm.Daphnia: LC₅₀ (48 h) >360 mg/l.Fish:LC₅₀ (96 h) for bluegill sunfish and rainbow trout >390, carp >900, sheepshead minnow 110 mg/l.Worms:LC₅₀ (14 d) for earthworms (Eisenia foetida) >1000 mg/kg.

Environmental fate:
Animals:Rapidly metabolised and excreted in the urine and faeces.Soil:Degraded rapidly in soil, predominantly via chemical pathways (microbial degradation plays a minor role). Major metabolite is [1-(3-ethylsulfonyl)-2-pyridinyl]-4,6-dimethoxy-2-pyrimidineamine. Rates of degradation are influenced by pH, anPlant:Half-life in maize 6 h, blackgrass 46 h, Johnsongrass 25 d and Sorghum bicolor 52 d. See also Biochemistry.

Transport Information

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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