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1、1043PROPICONAZOLE (160)EXPLANATIONPropiconazole was evaluated in 1987 and 1991. The 1991 JMPR required information on GAP and residue data from applications of the parent compound to barley and rice as a result of reconsidering the general limit for cereals (based on data submitted to the 1987 JMPR)
2、 as requested by the CCPR (ALINORM 91/24, para. 222; 91/24A, para. 202). In addition, residue data on melons, peppers and tomatoes from trials carried out according to GAP were considered desirable.Current information on GAP has been submitted for barley, cucurbits, grapes, melons, peppers, rice, su
3、gar beet, tomatoes and wheat. The manufacturer does not recommend the use of propiconazole on melons or tomatoes.Additional residue data on barley and rice, as well as on grapes, cucumbers and peppers, were provided by the manufacturer.USE PATTERNPropiconazole is used on barley in most of the cereal
4、-producing countries. Detailed information on GAP is given in Table 1 where those countries are listed for which residue data from supervised trials are available. As the national recommendations are rather uniform, these countries represent well the major barley-producing areas of the world.Propico
5、nazole is used on rice in Columbia, Italy, Malaysia and the USA. It is applied in the USA before the boot splits and the head emerges and in Malaysia at booting to heading, which corresponds to 35-40 days and a minimum of 40 days respectively.The use of propiconazole on peppers is recommended only i
6、n Italy.RESIDUES RESULTING FROM SUPERVISED TRIALSSupervised field trials conducted in various countries were reported to the Meeting. In these trials residues of the parent propiconazole, and in some cases total residues of compounds containing the common moiety dichlorobenzoic acid (DCBA), were det
7、ermined.Grapes. Seven supervised field trials were conducted in Spain, applying propiconazole 3 or 4 times at rates between 0.0094 and 0.08 kg ai/ha. Samples taken 32 to 80 days after the last application did not contain detectable residues (0.02 mg/kg). As the samples were taken at much longer inte
8、rvals than the registered PHI (15 days) the results do not affect the present MRL.Peppers. The residues of propiconazole in peppers were measured in one Italian and three Spanish trials. The fungicide was applied as a liquid formulation. The spraying was repeated 2-5 times at 2-propiconazole1044week
9、 intervals. The application rate ranged from 25 to 48 g ai/ha. The residues of propiconazole in the fruits were 0.02-0.27 mg/kg after a pre-harvest interval of 13-23 days (Table 2).Other vegetables. In two trials on artichokes in Spain propiconazole was applied at rates of 0.04 and 0.052 kg ai/ha. S
10、amples taken 11 days after application contained residues of 0.13 and 0.06 mg/kg respectively. In a single trial on cucumbers propiconazole was applied at a rate of 0.075 kg ai/ha. Residues 4-11 days after application were below the limit of determination (0.02 mg/kg).Table 1. National use patterns
11、of propiconazole.CropCountryApplicationPHI, daysForm. plant material and soil Analytical Method REM 130.02, Ciba-Geigy Basle, Switzerland.39. Madrid, S.O. and Cassidy, J.E. 1980. The uptake, distribution and characterization of triazole- and phenyl 14C-CGA- 64250 and their metabolites in greenhouse-
12、grown peanuts Report ABR-80006, Ciba-Geigy Corp., USA.40. Manule, P.J. and Toth, J. 1989. Determination of total residues of propiconazole in crops as 2,4-dichlorobenzoic acid by capillary gas chromatography Analytical Method AG-454B, Ciba-Geigy.41. Spain 1993. Information on compounds being on the priority list.
