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sethoxydim (Poast) Chemical Profile 3/85

                                     sethoxydim
      CHEMICAL NAME:      2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl]-3-
                          hydroxy-2-cyclohexen-1-one (58).
      TRADE NAME(S):      Poast (58)
      FORMULATION(S):     Liquid emulsifiable concentrate (1.5 lb/gal - 184
                          g/l) (56)
      TYPE:               Herbicide
      BASIC PRODUCER(S):  Nippon Soda Co., Ltd.
                          Agro-Pharm Div.
                          2-2-1, Ohtemachi, Chiyoda-kv,
                          Tokyo 100, Japan
                          BASF Wyandotte Corp.
                          100 Cherry Hill Rd.
                          Parsippany, NJ 07054
      PRINCIPAL USES:  For selective postemergence control of annual and
      perennial grasses in soybeans, cotton, peanuts, sugar beets, flax, rape
      seed (Canola/Canada), alfalfa, vegetables, and many other
      dicotyledoneous crops (56).
      APPLICATION METHOD(S):  Ground or aerial postemergence spray (58).
                                    I.  EFFICACY
      Important Weeds Controlled:  All annual grasses except Poa spp. and
      most perennial grasses.
           All broadleaf plants and sedges are tolerant to this product.
      Rainfall within 4-5 hours of application will not reduce grass control.
      Noticeable control of perennials the following season has been
      observed.  Some fesque species are tolerant (8b).
                              II.  PHYSICAL PROPERTIES
      MOLECULAR FORMULA:  C17 H29 O3 NS (58)
      MOLECULAR WEIGHT:   327.5 (58)
      PHYSICAL STATE:     Oily liquid, amber (pure compound) (58)
      ODOR:               Odorless (pure compound) (58)
      DECOMPOSITION TEMPERATURE:  Unstable at room temperature if
                                  unformulated (58).
      BOILING POINT:      >90 C/3 x 10-5 mmHg (pure compound) (62)
      VAPOR PRESSURE:     1.6 x 10-7 mmHg at 25 C (pure compound) (58)
      SOLUBILITY:         25 - 4700 mg/l water at 20 C (pH 4-7) (pure
                          compound) (62)
                          III.  HEALTH HAZARD INFORMATION
      OSHA STANDARD:  None established
      NIOSH RECOMMENDED LIMIT:  None established
      ACGIH RECOMMENDED LIMIT:  None established
      TOXICOLOGY
           A.  ACUTE TOXICITY
               DERMAL:  LD50 = >5000 mg/kg (rat) (62).
                        Product is non-toxic by dermal route.  Dermal
                          irritation in rabbits from formulation is moderate.
                          The active ingredient has low dermal toxicity, is
                          non-irritating to skin and is not a skin sensitizer
                          (58).
                        LD50 >4 g/kg (rat, formulated product) (65b).
               ORAL:    LD50 = 3200 mg/kg (rat) (62).
                        LD50 = 4920 mg/kg (rat, formulated product) (56).
                        LD50 = 2676 - 3,125 mg/kg (rat, technical compound)
                          (58).
               INHALATION:  Rat inhalation LC50 for one hour is >30 mg/l for
                            formulated compound.  The active ingredient has low
                            inhalation toxicity (58).
               EYES:    Eye irritation in rabbits from formulation is moderate.
                        The active ingredient is nonirritating to eyes (58).
           B.  SUBACUTE AND CHRONIC TOXICITY:
      Technical Compound:
           In a 90-day dietary rat and mouse study the minimum effect level
      was 900 ppm.
           In a 6-month dietary dog study, the minimum effect level was 600
      ppm (58).
      For Active Ingredient:
           Teratogenicity (rat and rabbit) - negative.
           Reproduction studies (2 generations rat) - negative (65b).
                         IV.  ENVIRONMENTAL CONSIDERATIONS
      Behavior In Or On Soils
      1.   Adsorption and leaching characteristics in basic soil types:
             These characteristics are under investigation.
      2.   Microbial breakdown:  Under investigation.
      3.   Loss from photodegradation and/or volatilization:  Photolysis is
             under investigation.  Loss from volatilization is mimimal.
      4.   Resultant average persistence at recommended rates:
                Soil                         Half-Life of Parent
                loamy sand pH 6.8            4-5 days
                loam pH 7.4                  11 days
           Soil persistence is rather short and the magnitude depends on soil
                type, moisture, and possibly other environmental conditions
                still to be investigated.  Efficiency is not dependent upon
                soil persistence, but soil activity prevents germination of
                grasses immediately after application (58).
           The technical formulation has demonstrated low toxicity to rodents,
      rabbits, birds, fish, aquatic invertebrates and pollinating insects (58).
                       V.  EMERGENCY AND FIRST AID PROCEDURES
           The chemical information provided below has been condensed from
      original source documents, primarily from "Recognition and Management
      of Pesticide Poisonings", 3rd ed. by Donald P.  Morgan, which have been
      footnoted.  This information has been provided in this form for your
      convenience and general guidance only.  In specific cases, further
      consultation and reference may be required and is recommended.  This
      information is not intended as a substitute for a more exhaustive
      review of the literature nor for the judgement of a physician or other
      trained professional.
           If poisoning is suspected, do not wait for symptoms to develop.
      Contact a physician, the nearest hospital, or the nearest Poison
      Control Center.
      EFFECTS OF OVEREXPOSURE:  Contact with eyes causes irritation,
      redness, corneal clouding which may persist a few days.  Prolonged skin
      contact produces irritation, redness and swelling.  Irritating to the
      nose, throat and lungs if mists are inhaled.  If swallowed may cause
      sedation, stomach upset, diarrhea, possible liver damage (65b).
           Ataxia, sedation, lachrymation, salivation, tremor, hematuria,
      diarrhea (58).
           SKIN CONTACT:  Wash skin thoroughly with soap and water.  Remove
      contaminated clothing and launder before wearing again.  If irritation
      develops, get medical attention (65b).
           INGESTION:  If swallowed, do not induce vomiting.  Consult a
      physician at once (65b).
           INHALATION:  If inhaled, move to fresh air.  Aid breathing, if
      necessary.  If irritation develops get medical attention (65b).
           EYE CONTACT:  Flush with flowing water at least 25 minutes.
      Consult a physician for eyes (65b).
                        VI.  FIRE AND EXPLOSION INFORMATION
      GENERAL:  Flash point 146 F (T.C.C.).  Flammability limits in air (% by
      volume):  Lower 1%, Upper 7%.  Firefighters should be equipped with
      full turn-out gear and self-contained breathing apparatus (65b).
      EXTINGUISHER TYPE:  Water fog, foam, CO2, dry chemical (65b).
                                VII.  COMPATIBILITY
           No incompatibilities known.  Non-corrosive (58).
                             VIII.  PROTECTIVE MEASURES
      STORAGE AND HANDLING:  Storage stability:  2 years (tests continuing)
      (58).  Keep out of reach of children.  Avoid prolonged contact with
      skin or clothing.  Do not get in eyes.  Do not take internally (65b).
      PROTECTIVE CLOTHING:  Goggles or side shield safety glasses, as
      conditions warrant (65b).
      PROTECTIVE EQUIPMENT:  Cannister or cartridge respirator for herbicides
      and hydrocarbon solvent mists if exposure to spray mist or vapors will
      occur (65b).
                        IX.  PROCEDURES FOR SPILLS AND LEAKS
                      IN CASE OF EMERGENCY, CALL, DAY OR NIGHT
                                   (800) 424-9300
                       PESTICIDE TEAM SAFETY NETWORK/CHEMTREC
           Wear rubber gloves, goggles and boots when cleaning up liquid
      spill.  Cover contaminated area with absorbent material until dry.
      After absorbent is removed, wash down the area with trisodium
      phosphate, household lye.  Poast is a regulated product.  Spills should
      be contained, absorbed and placed in suitable containers for disposal
      in an RCRA licensed facility (65b).
                               X.  LITERATURE CITED
       8b. Thomson, W.T.  1981.  Agricultural chemicals - book 2:
               herbicides.  Revised ed.  Thomson Publications, Fresno, CA.
               274 pp.
      56.  Farm Chemicals Handbook, 70th ed.  1984.  R. T. Meister, G. L.
               Berg, C. Sine, S. Meister, and J. Poplyk, eds.  Meister
               Publishing Co., Willoughby, OH.
      58.  Weed Science Society of America, Herbicide Handbook Committee.
               1983.  Herbicide handbook of the weed science society of
               America, 5th ed.  Weed Science Society of America, Champaign,
               IL.  515 pp.
      62.  The Pesticide Manual:  A World Compendium, 7th ed.  1983.  C.R.
               Worthing, ed.  The British Crop Protection Council, Croydon,
               England.  695 pp.
      65b. BASF Wyandotte Corporation.  1982.  Material safety data sheet:
               sethoxydim.  Wyandotte, MI.
      3/11/85