PHOSPHAMIDON JMPR 1972
Phosphamidon was considered in the Joint Meetings in 1965, 1966, 1968
and 1969 (FAO/WHO, 1965, 1967, 1969, 1970). In 1968, further
information was required on (1) the rates and frequencies of
application, pre-harvest intervals, and the resultant residues from
different countries and (2) the nature and persistence of the residues
in fruits and vegetables (fresh and processed) (FAO/WHO, 1969). The
third question asked in the Meeting on a specific analytical method
was dealt with in the 1969 Meeting (FAO/WHO, 1970).
RESIDUES IN FOOD AND THEIR EVALUATION
Phosphamidon is a systemic insecticide which acts against
non-resistant sucking pests and many chewing and mining insects. It is
recommended for application in perennial crops (fruit trees, citrus
trees, grapevine) and annual field plantations (rice, cotton, tobacco,
sugar cane, beets, potatoes, vegetables, fodder crops, cereals). Its
most important application so far has been in the control of stem
borers, particularly in rice.
According to available information, phosphamidon is officially
registered and/or approved for use in 56 countries.
Mean application rates are: 30-60 g a.i./100 l for fruit and citrus
trees, and grapevines; 0.2-0.4 kg a.i./ha for field and forage crops;
0.25-0.5 kg a.i./ha for vegetables; and 0.2-1.5 kg a.i./ha for rice
and sugar cane.
Multiple applications of phosphamidon are often utilized, depending on
pest incidence, and use recommendations allow for these treatments.
Several applications throughout the season are required against
aphids. In rice and sugar cane, stemborer control is normally achieved
with 2-4 applications.
RESIDUES RESULTING FROM SUPERVISED TRIALS
New residue data were made available to the Joint Meeting from
different countries. These data supported the residue levels
summarized by the 1968 Meeting (FAO/WHO, 1969). No alteration was
needed on the basis of the new information.
The Joint Meeting decided to recommend the temporary tolerances set by
the 1968 Meeting as tolerances.
Raw cereals 0.1
Apples, pears 0.5
Citrus fruit 0.4
Cucumbers, lettuce, tomatoes,
Cole crops, other vegetables
except root vegetables 0.2
Root vegetables, potatoes 0.05*
* at or about the limit of determination
Tolerances apply to the sum of phosphamidon and its desethyl
FURTHER WORK OR INFORMATION
FAO/WHO. (1965) Evaluation of the toxicity of pesticide residues in
food. FAO/PL/1965/10/1; WHO/Food Add./27.65.
FAO/WHO. (1967) Evaluation of some pesticide residues in food.
FAO/PL:CP/15; WHO/Food Add./67.32.
FAO/WHO. (1969) 1968 evaluations of some pesticide residues in food.
FAO/PL/1968/M/9/1; WHO/Food Add./69.35.
FAO/WHO. (1970) 1969 evaluations of some pesticide residues in food.
FAO/PL/1969/M/17/1; WHO/Food Add./70.38.