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tetradifon (Tedion V-18) Chemical Profile 4/85


      CHEMICAL NAME:      4-chlorophenyl 2,4,5-trichlorophenyl sulfone (56)


      TRADE NAME(S):      Tedion V-18 (56)

      FORMULATION(S):     Emulsifiable concentrate, wettable powder, smoke
                          generators.  Tedion V-18 emulsifiable concentrate;
                          7.52% w/v; Tedion V-18 wettable powder 18.8%;
                          Tedion V-18 smoke generator (56).

      TYPE:               Organosulfur miticide

      BASIC PRODUCER(S):  Philips-Duphar B.V.
                          Apollolaan 151
                          1077 AR Amsterdam, Holland
                          020-73 12 26

      STATUS:             General use EFFICACY

      PRINCIPAL USES:  Mites on fruit, vegetables, field crops and
      ornamentals.  Affects larval stages and females.  Nonsystemic (1).
      Larvicidal and ovicidal activity on spider mites.  Used on many species
      of fruits (including citrus and nuts), vegetables, cotton, hops, tea,
      and ornamentals (56).

                                   I.  EFFICACY

      Important Pests Controlled:  Most species of mites.  Laboratory
      observation has shown that treated adult female mites deposit eggs that
      either fail to develop or are delayed in their normal hatching period.
      Effective on all stages of mites except the adults (8a).
           Long residual effects although it is not fully systemic.  Not
      effective against over-wintering eggs.  Known to give mite control from
      six months to one year on citrus, and thirty to sixty days on deciduous
      fruits.  Kill of adult mites may be slow and several days may elapse
      before the full effect is realized.  Insects are not controlled (8a).

                             II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  C12 H6 Cl4 O2 S (62)

      MOLECULAR WEIGHT:   356.0 (62)

      PHYSICAL STATE:     Off-white to slightly yellow crystalline solid
                          (technical grade, greater than or equal to 95% pure)

      MELTING POINT:      Not below 144 C (technical grade) (56); 148-149 C
                          (pure compound) (62).

      VAPOR PRESSURE:     32 nPa at 20 C (technical grade) (62)

      SOLUBILITY:         Slightly soluble in water (56); 50 uG/l water at 10 C
                          (technical grade) (62).

                          III.  HEALTH HAZARD INFORMATION

      OSHA STANDARD:  None established

      NIOSH RECOMMENDED LIMIT:  None established

      ACGIH RECOMMENDED LIMIT:  None established


           A.  ACUTE TOXICITY

               DERMAL:  LD50 = 10,000 mg/kg (rabbit) (62)

               ORAL:    LD50 = >14,700 mg/kg (rat) (56)


           In 2-yr feeding trials rats receiving 300 mg a.i./kg diet suffered
      no ill-effect; offspring of rats receiving 1000 mg/kg diet were normal

                        IV.  ENVIRONMENTAL  CONSIDERATIONS

           Little or no hazard to birds, fish and beneficial insects.
      Relatively nonhazardous to honey bees.  Biological magnification
      unlikely.  Generally safe on plants (1).

      Approximate residual period:  1-3 weeks on plants (1).

      LC50 (8-day) for bobwhite quail, Japanese quail, pheasant and mallard
      duck was >500 mg/kg diet.  LC50 (3-hr) for carp is >10 mg/l (62).


           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 sub-
      stitute 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.

           To be developed.

                        VI.  FIRE AND EXPLOSION INFORMATION

           To be developed.

                                VII.  COMPATIBILITY

           Compatible with most insecticides and fungicides (1).  Non-corrosive

                            VIII.  PROTECTIVE MEASURES

           To be developed.

                       IX.  PROCEDURES FOR SPILLS AND LEAKS

                                  (800) 424-9300

                               X.  LITERATURE CITED

       1.  Harding, W.C.  1979.  Pesticide profiles, part one: insecticides
               and miticides.  Univ. Maryland, Coop. Ext. Serv. Bull. 267.
               30 pp.

       8a. Thomson, W. T.  1976.  Agricultural chemicals - book 1:
               insecticides, acaricides, and ovicides.  Revised ed.  Thomson
               Publ., Indianapolis, IN.  232 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.

      62.  The Pesticide Manual:  A World Compendium, 7th ed.  1983.  C.R.
               Worthing, ed.  The British Crop Protection Council, Croydon,
               England.  695 pp.