PESTICIDE RESIDUES IN FOOD - 1979 Sponsored jointly by FAO and WHO EVALUATIONS 1979 Joint meeting of the FAO Panel of Experts on Pesticide Residues in Food and the Environment and the WHO Expert Group on Pesticide Residues Geneva, 3-12 December 1979 CARBARYL Explanation Carbaryl has been evaluated on a number of occasions. An ADI has been established and maximum residue limits for carbaryl residues in commodities have been recommended. New Zealand submitted data in support of a request that the Meeting propose a maximum residue limit for carbaryl on kiwi fruit. RESIDUES IN FOOD AND THEIR EVALUATION USE PATTERN Kiwi fruit (Actinidia chinensis) is now the second largest horticultural product exported from New Zealand, the value being in excess of US $20 million annually. The fruit is, like most horticultural crops, subject to attack by a number of pests and diseases and to meet plant health requirements of countries importing New Zealand produced kiwi fruit it is necessary to spray regularly. Carbaryl is applied 5 times during the growing season, 4 times in combination with diazinon and then once alone in early April. The additional application is needed because of the short life of the chemical. The time interval between the last treatment and harvest is of the order of 21 days. The rate recommended for the first four sprayings is 80 g ai/100 L with 120 g ai/100L for the last spray, giving a total of 9.9 kg/ha in the season. RESIDUES RESULTING FROM SUPERVISED TRIALS No replicated trial data are available but some data following grower use in 1978 show that residues are not likely to exceed 10 mg/kg on the whole fruit. A summary of this information is included in Table 1. Table 1. Carbaryl residues on kiwi fruit. Number of Rate per Residue on Applications Application Kg a.i./ha Interval whole commodity ai g/100 L (days) (mg/kg) 6 120 16.12 delayed 2.0 sampling 1 120 2.7 13 3.1 4 220 9.3 9 7.4 2 270/400 9.9 9 5.1 Further monitoring indicated that when the interval between last application and harvest was as little as 9 days the residues ranged from 5 to 7.5 mg/kg carbaryl on total fruit. On the basis of this experience, and subsequent to 1978 the pre-harvest interval was extended to 21 days but the number of applications was increased as indicated above. Because of the hairy nature of the skin spray residues are retained on the fruit more than would be the case if the skin was smooth. However, in the case of non-systemic insecticides, trial data have shown that 90% of the residue remains on the skin. The skin, being hairy, is relatively unpalatable and is generally discarded. APPRAISAL Carbaryl is used in the regular spray programme for the control of pests of kiwi fruit. Data supplied by New Zealand, indicates that following approved uses, involving up to 5 sprays, the last within 21 days of harvest, carbaryl residues on the whole fruit could range up to 10 mg/kg. These data provide a basis for recommending a maximum residue limit on kiwi fruit. RECOMMENDATION The following additional maximum residue limit is recommended for carbaryl. kiwi fruit 10 mg/kg (This is based on a 21 day pre-harvest interval)
See Also: Toxicological Abbreviations Carbaryl (EHC 153, 1994) Carbaryl (HSG 78, 1993) Carbaryl (ICSC) Carbaryl (PIM 147) Carbaryl (FAO Meeting Report PL/1965/10/1) Carbaryl (FAO/PL:CP/15) Carbaryl (FAO/PL:1967/M/11/1) Carbaryl (FAO/PL:1968/M/9/1) Carbaryl (FAO/PL:1969/M/17/1) Carbaryl (AGP:1970/M/12/1) Carbaryl (WHO Pesticide Residues Series 3) Carbaryl (WHO Pesticide Residues Series 5) Carbaryl (Pesticide residues in food: 1976 evaluations) Carbaryl (Pesticide residues in food: 1977 evaluations) Carbaryl (Pesticide residues in food: 1984 evaluations) Carbaryl (Pesticide residues in food: 1996 evaluations Part II Toxicological) Carbaryl (JMPR Evaluations 2001 Part II Toxicological) Carbaryl (IARC Summary & Evaluation, Volume 12, 1976)