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Chemical Identification
Common Name
Flucycloxuron
中文通用名
氟环脲
IUPAC
1-{α-[(EZ)-4-chloro-α-cyclopropylbenzylideneaminooxy]-p-tolyl}-3-(2,6-difluorobenzoyl)urea (ratio 50–80% (E)- and 50–20% (Z)- isomers)
CAS
N-[[[4-[[[[(4-chlorophenyl)cyclopropylmethylene]amino]oxy]methyl]phenyl]amino]carbonyl]-2,6-difluorobenzamide
CAS No.
113036-88-7,94050-52-9
Molecular Formula
C25H20ClF2N3O3
Molecular Structure
Category
Activity
Acaricide/Miticide
Flucycloxuron is active against eggs and larvae of Coleoptera, Diptera and Lepidoptera, and eggs and nymphs of spider mites. It is primarily a stomach poison but also has some contact activity. Spring applications are recommended, when 75-90% of eggs have hatched. Good residual activity is achieved due to penetration of the leaf cuticle by the compound.

Field trials on apples have shown no phytotoxicity on any of the varieties tested and no russeting on the variety Golden Delicious, even at high doses.
CropUse
CropUses:
rice, soybeans, fruits, vegetables, cotton, ornamentals

Apples

12.5 g ai/hl

Orchard/glasshouse

10-15 g ai/hl

Ornamentals

20 ml ai/hl

Vines

125-150 g ai/ha

Other crops

35-50 g ai/ha

Physical Properties
Off-white to yellow crystalline solid. Melting point 143.6°C. Apolar solvents poor, polar solvents poor to good.
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin; mild eye irritant (rabbits). Inhalation: LC50 (4 h) for rats >3.3 mg/l air.
Environmental Profile
Ecotoxicology: 
Algae: NOEC for Selenastrum capricornutum >2.2 μg/l.Bees:Low toxicity to bees. Contact LD50 for honeybees >100 <μg/bee.Birds:Acute oral LD50 for mallard ducks >2000 mg/kg. Dietary LC50 (8 d) for mallard ducks and bobwhite quail >6000 mg/ kg diet.Daphnia: LC50 (48 h) 0.27 μg/l.Fish: LC50 (96 h) for rainbow trout and bluegill sunfish >100 mg/l.Worms: EC50 (14 d) for earthworms >1000 mg/ kg soil.Other aquatic spp.: LC50 (96 h) for mysid shrimp (Mysidopsis bahia) 340 ng/l.Other beneficial spp.:Slightly to moderately harmful to predatory mites ( IOBC). 

Environmental fate: 
Animals:Poorly absorbed from gastrointestinal tract; mainly excreted as unchanged parent compound in the faeces. Flucycloxuron absorbed is metabolised and further excreted in the urine, mainly as 2,6-difluorobenzoic acid and N-(4-carboxyphenyl)-N50 0.25-0.5 y.Plant:Non-systemic. Not metabolised on plants.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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