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Desmedipham (Betanex) Herbicide Profile 3/85


      CHEMICAL name:      Ethyl m-hydroxycarbanilate carbanilate (ester)

      TRADE name(S):      Betanex (58)

      FORMULATION(S):     Emulsifiable concentrate (1.3 lb/gal) (56)

      TYPE:               Carbamate herbicide

      BASIC PRODUCER(S):  NOR-AM Agricultural Products, Inc.
                          350 W. Shuman Blvd.
                          Naperville, IL 60566

      STATUS:             General use

      PRINCIPAL USES:  Postemergence sugarbeet herbicide for control of
      annual weeds such as pigweed, mustard, lambsquarters, nightshade,
      shepherdspurse, London rocket, chickweed, buckwheat, ragweed,
      fiddleneck, and kochia (58).

      APPLICATION METHOD(S):  Desmedipham is applied as a postemergence
      foliar spray, etiher as a broadcast or as a band application (58).

                                    I.  EFFICACY

      Important Weeds Controlled:  The same as Betanal (phenmedipham) except
      most effective on pigweed (8b).

           Rainfall within 6 hours will reduce the effectiveness (8b).

                              II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  C16 H16 N2 O4 (58)

      MOLECULAR WEIGHT:   300.3 (58)

      PHYSICAL STATE:     Colorless or light yellow crystalline substance
                          (pure compound) (58); the technical grade is c. 96%
                          pure (62).

      MELTING POINT:      120 C (pure compound) (58)

      VAPOR PRESSURE:     Low (pure compound) (58); 400 nPa at 25 C (pure
                          compound) (62).

      SOLUBILITY:         9 mg/l water at room temperature (pure compound)

                          III.  HEALTH HAZARD INFORMATION

      OSHA STANDARD:  None established

      NIOSH RECOMMENDED LIMIT:  None established

      ACGIH RECOMMENDED LIMIT:  None established


           A.  ACUTE TOXICITY

               DERMAL:  LD50 = >318 mg a.i. (as e.c.)/kg (rabbit) (62).
                        LD50 = >2,025 <10,250 mg/kg (rabbit, Betanex-16%
                          desmedipham) (58).
                        Some irritation may occur after prolonged skin
                          contact with Betanex (16.0% desmedipham) (58).

               ORAL:    LD50 = 10,260 mg a.i./kg (rat) (62).
                        LD50 = 3,720 mg/kg (rat), 2,150 mg/kg (dog-minimum
                          lethal dose) (Betanex-16% desmedipham) (58).


           Ninety-day feeding studies with Betanex (containing 16.0%
      desmedipham) on rats and dogs showed a no-effect level of more than
      1,250 ppm of the formulation in the diet (58).

                         IV.  ENVIRONMENTAL CONSIDERATIONS

      Behavior In Or On Soils

      1.   Adsorption and leaching characteristics in basic soil types:
             Desmedipham remains in the top layers of soil (0 to 2 inches)
             after application.  No appreciable leaching occurs.
      2.   Resultant average persistence at recommended rates:  Half life of
             desmedipham in silty loam, sandy loam and silty clay loam
             soils was less than 1 month (58).

      General toxicity to wildlife and fish:

           Toxicities of Betanex (16% desmedipham):
             Bobwhite quail, oral LC50 - 4 days - 2,480 mg/kg
             Trout LC50 - 96 hr 3.8 ppm
             Bluegill LC50 - 96 hr 13.4 ppm (58)

           Acute oral LD50 = 390 mg a.i. (as e.c./kg) (quail) (62).

           LC50 (96 hr) is:  for rainbow trout 0.6 mg a.i. (as e.c.)/l;
           for bluegill 2.1 mg a.i. (as e.c.)/l (62).

           Toxic to fish (8b).


           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.

      SYMPTOMS OF POISONING:  Hypoactivity, muscular weakness (58).

           SKIN CONTACT:  Thoroughly rinse contaminated areas (58).

           INGESTION:  Induce vomiting (58).

           EYE CONTACT:  Thoroughly rinse contaminated areas (58).

                        VI.  FIRE AND EXPLOSION INFORMATION

           Flammability:  Flash point:  68 C (TOC-ASTM D-1310) (58).

                                VII.  COMPATIBILITY

           Desmedipham formulation presents no particular corrosion problems

                             VIII.  PROTECTIVE MEASURES

      STORAGE AND HANDLING:  Betanex was stable for 4.5 months during an
      accelerated storage test at 70 C.  Do not breathe spray mist.  Do not
      eat, drink, or smoke while spraying (58).
           Do not store below -20 C.  Wear goggles to prevent splashing into
      eyes (56).

      PROTECTIVE CLOTHING:  None required (56).

                        IX.  PROCEDURES FOR SPILLS AND LEAKS

                      IN CASE OF EMERGENCY, CALL, DAY OR NIGHT
                                   (800) 424-9300

                               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.