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oxythioquinox (Morestan) Chemical Profile 4/85


      CHEMICAL NAME:      6-methyl-1,3-dithiolo [4,5-b] quinoxalin-2-one (56)

      TRADE NAME(S):      Morestan (56)

      FORMULATION(S):     Wettable powder and dust (56)

      TYPE:               Organic hydrocarbon insecticide-miticide-fungicide

      BASIC PRODUCER(S):  Mobay Chemical Corp., Agricultural Chemicals Div.
                          Box 4913
                          Hawthorn Rd.
                          Kansas City, MO 64120

      STATUS:             General use

      PRINCIPAL USES:  Residual control of mites, mite eggs, powdery
      mildew and pear psylla.  Used as a pre-bloom spray on most deciduous
      fruits and in both pre- and post-bloom sprays on apples and pears.  Also
      registered for multiple applications to citrus, vegetable, walnuts, and
      ornamentals.  Smoke generator used to fumigate in greenhouses (56).

                                   I.  EFFICACY

      Important Pests Controlled:  Mites, pear psylla, white flies and aphids.
      Powdery mildew is also controlled (8a).
           Active against all stages of mites and against pear psylla.
      Protective and eradicative activity against powdery mildew (8a).

                             II.  PHYSICAL PROPERTIES

      MOLECULAR FORMULA:  C10 H6 N2 O S2 (62)

      MOLECULAR WEIGHT:   234.3 (62)

      PHYSICAL STATE:     Yellow crystals (pure compound) (62)

      MELTING POINT:      169.8-170 C (pure compound) (62)

      VAPOR PRESSURE:     27 uPa at 20 C (pure compound) (62)

      SOLUBILITY:         Practically insoluble in water (pure compound) (62)

                          III.  HEALTH HAZARD INFORMATION

      OSHA STANDARD:  None established

      NIOSH RECOMMENDED LIMIT:  None established

      ACGIH RECOMMENDED LIMIT:  None established


           A.  ACUTE TOXICITY

               DERMAL:  LD50 = >500 mg/kg (7 day) (rat) (62)
                        LD50 = >2000 mg/kg (rat, technical product) (56)

               ORAL:    LD50 = 2500-3000 mg/kg (rat) (62)
                        LD50 = about 2500-3000 mg/kg (rat, technical product)


           In 2-yr feeding trials rats receiving 60 mg/kg diet suffered no
      ill effect (62).

                        IV.  ENVIRONMENTAL  CONSIDERATIONS

           Some hazard to birds, fish and beneficial insects.  Relatively
      nonhazardous to honey bees.  Biological magnification unlikely.  Injury
      reported on Delicious and Winesap apples, also some ornamentals such as
      alders and roses (1).

      Approximate Residual Period:  30 days on plant surfaces; 2 months on
      unexposed surfaces (1).

           It is non-toxic to honeybees (62).  Toxic to fish (8a).


           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

           Incompatible with oils (phytotoxic).  In late spring or summer may
      be phytotoxic when mixed with most insecticides and fungicides.  Check
      label (1).

                            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.