PESTICIDE RESIDUES IN FOOD - 1982


    Sponsored jointly by FAO and WHO






    EVALUATIONS 1982





    Data and recommendations of the joint meeting
    of the FAO Panel of Experts on Pesticide Residues
    in Food and the Environment and the
    WHO Expert Group on Pesticide Residues
    Rome, 23 November - 2 December 1982

    Food and Agriculture Organization of the United Nations
    Rome 1983


    CYANOFENPHOS

    

    Explanation

         Cyanofenphos was evaluated by the 1975 Joint Meeting (FAO/WHO
    1976) and by the 1980 Joint Meeting (FAO 1981).1/ Further information
    was requested on residues in various food commodities. In addition the
    Codex Committee on Pesticide Residues considered the residue data
    in/on cabbage insufficient for establishing a Codex MRL. To meet the
    latter requirement the 1982 Meeting was provided with the results of
    supervised trials on cabbage.

    RESIDUES IN FOOD AND THEIR EVALUATION

    RESIDUES RESULTING FROM SUPERVISED TRIALS

         The trials were carried out in Japan and in Taiwan. Province of
    China by applying cyanofenphos at the recommended or slightly higher
    rates. The residues in cabbage and Chinese cabbage were in the range
    of those published in the 1975 Evaluation. The details of experiments
    are summarized in Table 1 (Sumitomo 1982a, b).

    APPRAISAL

         Cyanofenphos was evaluated in 1975 and 1980. Further information
    was requested on residues in various food commodities. In addition,
    the CCPR requested further residue data in/on cabbage.

         In supervised trials, the residue levels detected in cabbage and
    Chinese cabbage treated with cyanofenphos at the recommended rates
    were in the range of 0.6-1 mg/kg 21 days after treatment, which is the
    proposed preharvest interval. These results are in agreement with the
    earlier ones considered by the 1975 JMPR.

              

    1/  See Annex 2 for FAO and WHO documentation.

        Table 1.  Residues resulting from supervised trials on cabbage
                                                                                                                                           

                                            Application                       Residues (mg/kg) at intervals (days) after application
                                                   Rate
    Crop         Country      Year       No.    (kg a.i./ha)   Formulation   0     1      3      7      14     21     28-30    35-37
                                                                                                                                           

    Cabbage1/    Japan       1981-82     2           1            25 EC                                        0.6     0.17     0.16
                 Japan       1981-82     2           0.75         25 EC                                                0.48     0.21

    Chinese2/    Taiwan      1982        1           0.5          25 EC      14    11     9.1    4.6    1.7    0.9     0.7      0.27
    cabbage      (Prov. of               1           0.75         25 EC      17    13     10     6.2    2.4    1       1.2      0.48
                 China)
                                                                                                                                           

    1/   Mean value of two replicates.

    2/   Mean value of four replicates.
        RECOMMENDATIONS

         The Meeting concluded that the 2 mg/kg limit is still suitable to
    cover the wide residue distribution measured in samples taken after
    the recommended preharvest interval.

    REFERENCES

    Sumitomo Chem. Co. Residue Study with Surecide (cyanofenphos) in
             cabbage. Doc. Code GR-11. (Unpublished)

    Sumitomo Chem. Co. Surecide residue monitoring studies on Chinese
             cabbage. Doc. Code GR 21. (Unpublished)

    See Also:
       Toxicological Abbreviations
       Cyanofenphos (WHO Pesticide Residues Series 5)
       Cyanofenphos (Pesticide residues in food: 1980 evaluations)