Residues resulting from supervised trials

Data from many supervised trials on peaches, broccoli, head cabbages, cauliflowers, melons, egg plants and tomatoes were submitted or resubmitted to the Meeting, but some reports lacked important information so the Meeting did not evaluate trials which lacked data on analytical recoveries or those with abnormally high residues in control samples and for which no representative chromatograms were supplied. In such cases, it was not clear whether the control samples were contaminated or the analysis was at fault. The trials which were considered to be unsuitable for evaluation are shaded in the Tables.

Residues in crops

Peaches. Ten supervised trials were carried out in Italy and Spain. The summarized data are shown in Table 3.

Table 3. Residues of methamidophos in peaches. All SL formulations.

Country Year	Application			PHI, days	Residues	Reference
	No.	kg ai/ha	kg ai/hl
Italy 1994	2	0.68	0.057	01	0.19	36
				0	1.1
				7	0.41
				14	0.26
				21	0.16
				28	0.11
Italy 1994	2	0.68	0.057	01	0.13	37
				0	0.67
				21	0.12
				28	0.06
Italy 1994	2	0.6	0.05	01	0.12	34
				0	0.39
				21	0.09
				28	0.04
Italy 1994	2	0.6	0.05	01	0.41	31
				0	0.95
				7	0.55
				14	0.28
				21	0.27
				28	0.13
Spain 1994	2	0.6	0.048	01	0.26	33
				0	1.3
				6	0.59
				14	0.27
				21	0.09
				28	0.09
Spain 1994	2	1	0.054	01	0.6	35
				0	1
				21	0.27
				28	0.15
Spain 1995	1	0.72	0.048	28	<0.01	1
				35	<0.01
	1	1.1	0.072	28	0.11
				35	0.07
Spain 1995	1	0.86	0.048	28	0.12	1
				35	0.24
	1	1.3	0.072	28	0.4
				35	0.76

¹ Sampling just before last application

Broccoli. Eighteen supervised trials were carried out in Brazil, Canada, Mexico and the USA. The results are shown in Table 4.

Table 4. Residues of methamidophos in broccoli.

Country Year	Application				PHI, days	Residues1	Reference
	Form.	No.	kg ai/ha	kg ai/hl
Brazil 1987	SL	5	0.6	0.06	0	1.6	272
					14	<0.01
					21	<0.01
					28	<0.01
		5	1.2	0.12	21	0.01
Brazil 1995	SL	3	0.6	0.06	21	0.2	76
		3	1.2	0.12	21	0.6
Canada 1995	EC	3	1.08		14	0.01, 0.01	793
Canada 1972	EC	8	1.12	0.12	0	13.05	24
					3	5.87
					7	1.88
					14	0.13
Canada 1972	EC	8	1.12	0.14	0	0.95	34
					3	0.94
					7	0.99
					14	0.41
Mexico 1995	EC	2	0.9	0.3	21	<0.01, 0.08	464
USA 1974	SC	5	1.12		0	2.15(H), 2.85 (L)	124
					7	0.92(H), 3.64(L)
					14	0.42(H), 2.24(L)
					21	0.14(H), 0.88(L)
					28	0.04(H), 0.45(L)
USA 1974	SC	3	1.12	0.48	21	0.06(H), 0.75(L)	114
					28	0.09(H), 0.54(L)
					35	0.02(H), 0.24(L)
					42	0.03(H), 0.07(L)
USA 1973	SC	3	1.12	0.34	14	0.03(H), 0.74(L)	44
					21	0.01(H), 0.11(L)
					28	<0.01(H), 0.06(L)
					35	<0.01(H), 0.03(L)
					42	<0.01(H), <0.01(L)
USA 1973	SC	6	1.12	0.34	0	1.55(H), 7.15(L)	34
					7	1.10(H), 0.01(L)
					14	0.12(H), 0.22(L)
					21	0.02(H), 0.11(L)
					28	<0.01(H), 0.02(L)
	SC	3	1.12	0.2	14	<0.01(H), 0.54(L)	84
					21	<0.01(H), 0.06(L)
					27	0.02(L)
USA 1974	SC	3	1.12	0.27	14	2.84(H), 4.98(L)	94
					21	0.01(H), <0.01(L)
					26	<0.01(H), <0.01(L)
					35	0.02(H), 0.04(L)
					42	<0.01(H), 0.02(L)
USA 1973	SC	3	1.12	0.12	14	0.28	144
					21	0.02
					28	0.03
					35	0.01
USA 1973	SC	5	1.12	0.2	0	1.32(H), 22.93(L)	54
					7	0.33(H), 2.51(L)
					13	0.15(H), 1.14(L)
USA 1974	SC	5	1.12	0.12	0	1.52	134
					7	0.21
					14	0.05
					21	0.01
USA 1974	SC	5	1.12	0.27	0	2.65(H), 7.3(L)	104
					7	2.53(H), 9.07(L)
					14	1.27(H), 7.62(L)
					21	<0.01(H), 0.08(L)
					28	<0.01(H), <0.01(L)

¹ (H) head (L) leaves

² The data were also submitted to the 1990 JMPR

³ The 2 results were from duplicate plots. The higher values of each pair were used to estimate both maximum residue levels and STMRs

⁴ No data on analytical recoveries

Head cabbages. Six supervised trials were carried out in Argentina, Brazil, Germany and Mexico. The results are shown in Table 5.

Table 5. Residues of methamidophos in head cabbages.

Country, Year	Application				PHI, days	Residues1	Reference
	Form	No.	kg ai/ha	kg ai/hl
Argentina 1995	EC	1	0.6	0.16	14	<0.05	631
					21	<0.05
					30	<0.05
Brazil 1995	SL	3	0.6	0.06	21	0.08	77
		3	1.2	0.12	21	0.2
Germany 1977	SL	3	0.36	006	0	1.95	15
					7	0.23
					14	0.2
					21	0.06
					28	0.07
Germany 1977	SL	3	036	0.06	0	<0.01	16
					7	0.16
					14	0.03
					21	0.02
					28	0.05
Mexico 1995	EC	2	0.9	0.3	35	<0.01, 0.02	651,2

¹ No data on analytical recoveries
² The 2 results were from duplicate plots. The higher value was used to estimate both maximum residue levels and STMRs