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Information @ a Glance

General

  • Dimethoate is a widely used organophosphate insecticide used to kill insects . It was patented and introduced in the 1950s by American Cyanamid.
  • Dimethoate is broad-spectrum systemic insecticide that is able to enter the sap stream of plants - where it is transported to actively growing parts. This makes it particularly effective against sucking insect pests such as aphids. Also very useful fruit fly control for many fruit and vegetable crops. Dimethoate will not control OP resistant pests.
  • Dimethoate is an insecticide that is a white solid with a strong odor. Dimethoate has a crystalline structure, which means that it has a form resembling sand or sugar.
  • Dimethoate is available in aerosol spray, dust, emulsifiable concentrate, and ULV concentrate formulations.
  • Dimethoate is taken up into the roots of plants and translocated to aboveground parts, where it is toxic to any sucking insect feeding on the plant juices (e.g., aphids, leafhoppers, and thrips).
  • Dimethoate breaks down faster in moist soils. It is rapidly broken down by most soil microorganisms.

Toxicity

  • Dimethoate is moderately toxic (World Health Organisation class II) by ingestion, inhalation and dermal absorption.
  • Dimethoate may affect reproduction: in a multiple generation study in mice, reproductive performance was impaired at high doses but only in the presence of marked cholinergic effects.
  • Dimethoate is classified as a possible human carcinogen by the US EPA, based on tumors in mice, the compound-related (no dose response) weak effect of combined spleen, skin and lymph tumors in male rats, and positive mutagenic activity associated with dimethoate.

Physical Properties

  • Water Solubility: 25 g/L @ 21℃
  • Solubility in Other Solvents: s. in methanol and cyclohexane; s.s in aliphatic
    hydrocarbons, aromatic hydrocarbons, diethyl ether, carbon tetrachloride,
    hexane, and xylene; v.s. in chloroform, benzene
  • Melting Point: 43-45℃ (technical)
  • Vapor Pressure: 1.1 mPa @ 25℃
  • Partition Coefficient: 0.6990
  • Adsorption Coefficient: 20

Benefits

  • Particularly effective against sucking insect pests.
  • Broad-spectrum systemic activity in many use situations.
  • Relatively short withholding periods on some crops.
  • Can be used as a post-harvest dip treatment (quarantine treatment only).
  • Can be used in dilute or concentrate spraying.
  • Low application rates - economical to use.

     

Report

  • Dimethoate released to the environment does not adsorb onto the soil and is subject to considerable leaching. It is also lost from the soil through evaporation and biodegradation.
  • The half-life of dimethoate in soil ranges from four to 16 days.4 It is relatively stable in aqueous media at pH 2 to 7.5 Reported half-lives for dimethoate in raw river water range from 18 hours to eight weeks.
  • Dimethoate is degraded in the environment to another more toxic pesticide, omethoate; the proportion of omethoate in the
    total residue reaches about 50% after five weeks.
     

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