Benfluralin

Benfluralin

乙丁氟灵

N-butyl-N-ethyl-a,a,a-trifluoro-2,6-dinitro-p-toluidine

N-butyl-N-ethyl-2,6-dinitro-4-(trifluoromethyl)benzenamine

1861-40-1

C₁₃H₁₆F₃N₃O₄

Herbicides > Dinitroaniline herbicides

Pre-emergence selective herbicide. Affects physiological growth processes associated with seed germination.

Pre-emergence control of many annual grasses and broad-leaved weeds in cotton, fruit trees, nut trees, vines, ornamentals, soya beans, berries, rice, amenity turf and non-crop areas. Applied at 0.24-0.48 kg/ha in rice, 0.72-0.96 kg/ha in cotton, 0.96-2.16 kg/ha in soya beans, and 1.92-4.5 kg/ha in vines, tree crops and non-crop areas.

GR = Granule
SC = Suspension concentrate (=flowable concentrate)
WG = Water dispersible granules
WP = Wettable powder

Molecular weight:335.3; Physical form:Yellow-orange crystals. Density:1.28 (20 °C) (); Melting point:65-66.5 °C; Flash point:151 °C (Setaflash closed cup; D-3278); Vapour pressure:8.76 (25 °C); Henry constant:29.4 Pa m3 mol-1 (25 °C, ); Partition coefficient(n-octanol and water):logP = 5.29 (20 °C, 7); Solubility:In water 0.1 /l (25 °C). In acetone, ethyl acetate, dichloromethane, chloroform >1000, toluene 330-500, acetonitrile 170-200, hexane 18-20, methanol 17-18 (all in g/l, 25 °C).; Stability:Decomposed by light. Stable for up to 30 days at 5-9 (26 °C).;

Oral:Acute oral 50 for rats >10 000, mice >5000, dogs and rabbits >2000 /. Percutaneous:Acute percutaneous 50 for rabbits >5000 /kg. Moderately irritating to skin and eyes (rabbits). Inhalation:50 (4 h) >2.16 /l air. ADI:0.005 /.

Ecotoxicology: 
Algae:For Selenastrum capricornutum (7 d), 3.86 /l reduced specific growth rate and terminal biomass by 16.6% and 34.3% respectively.Bees:Low toxicity; 33% formulation had no effect up to 100 in 60% sucrose, but at 1000 , mortality was increased.Birds:Acute oral 50 for mallard ducks, bobwhite quail, and chickens >2000 /.Daphnia:50 2.18 /l.Fish:50 for bluegill sunfish 0.065, rainbow trout 0.081, sheepshead minnow >1.1 /l.Other aquatic spp.:50 (shell deposition) for eastern oyster (Crassostrea variegatus) >1.1 /l; 50 for mysid shrimp (Mysidopsis bahia) 0.043 /l. 

Environmental fate: 
Soil:Soil 50 (anaerobic) 15 d, (aerobic) 2.8 w to 1.7 ; aquatic 50 (anaerobic) 38.4 h; soil photolysis 50 12.5 d. Duration of residual activity in soil is

Hazard Class:III(Slightly hazardous)