Pears

Pears. In a trial on pears in Australia (Armstrong, 1995) a single tree per plot was used with three replicates. Treatments were with a motorized hand sprayer and each tree was sprayed near to the point of run-off. The application rates were higher than proposed GAP. Samples were analysed by GC-MS.

Two trials were carried out in Italy in 1992 with 6 trees per plot. Three applications were made at intervals of 30 days. One trial complied with GAP and showed a residue of 0.23 mg/kg.

Several trials in New Zealand were designed to assess the decline of residues at different application rates. Single trees were treated, with four replicates. Samples were analysed by HPLC and the reported LOD was 0.03 mg/kg. The residues from treatments closest to GAP ranged from 0.09 to 0.29 mg/kg (Tillman, 1995b).

The results are shown in Table 23.

Table 23. Residues of tebufenozide in pears. Underlined residues are from trials according to GAP.

Country, location, year	Form.	No.	Application		PHI, days		Residue, mg/kg	Reference
			kg ai/ha	kg ai/hl
Australia	WP	8	0.24	0.012	0		1.3	Armstrong, 1995c
1994-1995					7		1.2
					14		1.0
					21		1.0
					28		1.4
Australia	WP	8	0.48	0.024	0		2.1	Armstrong, 1995c
1994-1995					7		2.0
					14		2.0
					21		2.2
					28		1.7
Australia	SC	8	0.24	0.012	0		1,9	Armstrong, 1995c
1994-1995					7		2.0
					14		1.8
					21		1.4
					28		1.5
Australia	SC	8	0.48	0.024	0		2.4	Armstrong, 1995c
1994-1995					7		2.8
					14		1.5
					21		1.8
					28		2.7
Australia	WP	7	0.24	0.012	0		0.9	Armstrong, 1995c
1994-1995					7		0.7
					14		0.7
					28		0.3
Australia	WP	7	0.48	0.024	0		1.5	Armstrong, 1995c
1994-1995					7		1.0
					14		1.0
					28		0.7
Italy	SC	3	0.216	0.014	14		0.23	Mellet, 1994
1992	SC	3	0.432	0.029	14		0.58
New Zealand	WP	8	0.048-0.054	0.003	1		0.15	Tillman, 1995b
Hawke's Bay, 1994/95					7		0.09
					14		0.06
					21		0.10
New Zealand	WP	8	0.096-0.108	0.006	1		0.17	Tillman, 1995b
Hawke's Bay, 1994/95					7		0.14
					14		0.1
					21		0.09
New Zealand	WP	8	0.192-0.216	0.012	1		0.04	Tillman, 1995b
Hawke's Bay, 1994/95					7		0.21
					14		0.29
					21		0.21
New Zealand	WP	10	0.057-0.062	0.003	0		0.09	Tillman, 1995b
Nelson, 1994/1995					7		0.10
					14		0.08
					21		0.09
					28		<0.03
New Zealand	WP	10	0.114-0.123	0.012	0		0.15	Tillman, 1995b
Nelson, 1994/1995					7		0.14
					14		0.16
					21		0.28
					28		0.1
New Zealand	WP	10	0.228-0.246	0.012	0		0.4	Tillman, 1995b
Nelson, 1994/1995					7		0.34
					14		0.29
					21		0.18
					28		0.24
New Zealand	WP	7	0.09	0.003	0		0.08	Tillman, 1995b
Nelson, 1994/1995					7		0.07
					14		0.04
					21		0.05
					28		0.1
New Zealand	WP	7	0.180	0.006	0		0.16	Tillman, 1995b
Nelson, 1994/1995					7		0.09
					14		0.09
					21		0.07
					28		0.07
New Zealand	WP	7	0.360	0.012	0		0.23	Tillman, 1995b
Nelson, 1994/1995					7		0.37
					14		0.16
					21		0.25
					28		0.24