SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 741582
CASRN 741-58-2
SynonymsBensulide
Phosphorodithioic acid, O,O-bis(1-methylethyl) S-[2-[(phenylsulfonyl)amino]ethyl]ester
Betasan
Disan
Prefar
SAP
Analytical Method EPA Method 636
Molecular FormulaC14H24NO4PS3

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use SELECTIVE PREEMERGENCE HERBICIDE For the control of undesirable grasses in lawns and broadleaf weeds. Seasonal control of carbgrass, annual bluegrass in grass dichondra lawns. Prefar is for crop use in carrots, cole crops. BETASAN IS REGISTERED FOR CONTROL OF REDROOT, PIGWEED, WATERGRASS, LAMBSQUARTERS, SHEPHERDSPURSE, GOOSEGRASS, AND DEADNETTLE IN GRASS & DICHONDRA LAWNS. Pre-emergence control of annual grasses and broad-leaved weeds in established turf, dichonda, brassicas, cucurbits, watermelons, cotton, lettuce, tomatoes, carrots, capsicums, rice, and herbage seed crops.
Apparent Color VISCOUS AMBER LIQUID ABOVE 34.4 DEG C, SOLID BELOW ; COLORLESS LIQUID OR WHITE CRYSTALLINE SOLID
Melting Point 34.4 DEG C
Molecular Weight 397.52
Density 1.23 @ 20 DEG C/20 DEG C
Environmental Fate TERRESTRIAL FATE: EFFECTS PERSIST FOR 0.33-1.0 YR ACCORDING TO RATE OF APPLICATION. BENSULIDE IS INACTIVATED IN SOILS CONTAINING HIGH AMOUNTS OF ORGANIC MATTER. LEACHES VERY LITTLE IN SAND, CLAY OR ORGANIC SOILS. THE HALF LIFE IN MOIST LOAM SOIL @ 70-80 DEG F WAS 4 MO. IN A MOIST LOAMY SAND SOIL @ 70-80 DEG F THE HALF-LIFE WAS 6 MO. COMPLETE DISSIPATION OF BENSULIDE RESIDUES TOOK 8-10 MO @ APPLICATION RATE OF 5 LB/ACRE. DOUBLING APPLICATION RATE RESULTED IN PERSISTENCE OF 2 MO LONGER. DEGRADATION WAS INCR BY INCR SOIL TEMP & ORG MATTER CONTENT BUT DECR WITH INCR PH.

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