Fenbuconazole

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Fenbuconazole

中文通用名

腈苯唑

IUPAC

(RS)-4-(4-chlorophenyl)-2-phenyl-2-(1H-1,2,4-triazol-1-ylmethyl)butyronitrile

CAS

α-[2-(4-chlorophenyl)ethyl]-α-phenyl-1H-1,2,4-triazole-1-propanenitrile

CAS No.

114369-43-6

Molecular Formula

C₁₉H₁₇ClN₄

Molecular Structure

General Product Information

Category

Fungicides > Triazole fungicides

Activity

Fungicide
Fenbuconazole is effective against ascomycetes, basidiomycetes and deuteromycetes. Following foliar application, the compound is translocated acropetally. Fenbuconazole has residual activity lasting 4-5 weeks. The optimum timing for protectant applications in wheat is at GS 38-45.

In field trials, fenbuconazole gave similar levels of disease control at lower application rates when compared with other azoles.

CropUse

CropUses:
apples, cereals, fruits (including vines), nuts, oilseed rape, ornamentals, pears, sugar beets, turf, vegetables, vines

Cereals	75-125 g ai/ha
Oilseed rape	60-75 g ai/ha
Sugar beet	65-280 g ai/ha
Peanuts	75-150 g ai/ha
Rice	50-150 g ai/ha
Turf	75-250 g ai/1,000m²
Vines	30-45 g ai/ha
Nuts	18-25 g ai/ha
Fruit	50-75 g ai/ha
Ornamentals	5-10 g ai/ha
Vegetables	50-100 g ai/ha

Premix

Emulsifiable concentrate (EC) ;Emulsion-in-water (EW) ;Suspension concentrate (SC);Wettable powder (WP)
Premix Parters:
cypermethrin; dimethoate; esfenvalerate; fenobucarb; fenvalerate; methabenzthiazuron; permethrin; tetramethrin; trichlorfon;

Physical & Safety Data

Physical Properties

Molecular weight:336.8; Physical form:Colourless crystals. Melting point:124-126 °C; Vapour pressure:0.005 mPa (20 °C); Partition coefficient(n-octanol and water):logP = 3.23; Solubility:In water 0.2 mg/l (25 °C). Soluble in common organic solvents such as ketones, esters, alcohols, and aromatic hydrocarbons. Insoluble in aliphatic hydrocarbons.; Stability:Stable to hydrolysis in the dark, DT50 >2210 d ( pH 5), 3740 d ( pH 7), 1370 d ( pH 9). Thermostable up to 300 °C.;

Toxicology

Oral:Acute oral LD₅₀ for rats >2000 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rats >5000 mg/kg. Non-irritating to eyes and skin ( tech.); severe irritant to eyes and skin (EC formulation) (rabbits). Inhalation: LC₅₀ (4 h) for rats >2.1 mg/l air (for tech.). ADI:0.005 mg/ kg.

Environmental Profile

Ecotoxicology:
Bees: LC₅₀ (96 h, dust exposure) >0.29 mg/bee.Birds:Dietary LC₅₀ (8 d) for bobwhite quail 4050, mallard ducks 2110 mg/ kg diet. LC₅₀ (21 d) for bobwhite quail 2150 mg/ kg daily.Fish: LC₅₀ (96 h) for bluegill sunfish 0.68 mg/l ( tech.).

Environmental fate:
Soil:Soil adsorption K_oc 2100-9000 (clay, loam, sand, sandy loam, silty clay loam).Plant:In peanuts, degraded by three routes: oxidation at the benzylic carbon, leading to oxidative degradation products including a ketone and some lactones, substitution on the carbon next to the triazole ring, leading to triazolylalanine and triazolylacetic a

Transport Information

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