Rice. A total of eight trials, four of them official, with two different formulations, 0.75DL (dustless) and 10WP, were conducted in Japan (Komatsu and Yabusaki, 1992c). The results of duplicate analyses were averaged. Rice samples were harvested at maturity: pre-harvest intervals were varied by changing the date of the last spray application rather than the date of harvest. After harvesting, samples were dried and rough rice was dehulled and sieved through a 1.7 mm sieve. Samples of grain and staw were analysed for the parent compound and in some cases for RH-1788 and RH-6595 by the methods of Komatsu and Yabusaki (1992a,b). The reported LOD was 0.005 mg/kg.
Two trials were conducted in 1992 in Spain (Mellet, 1993b) with one aerial application at a rate of 0.240 kg ai/ha. The plot sizes were 5 and 10 ha. Rice was harvested 37 or 54 days after the treatment. Approximately 1 kg each of straw, brown rice and cleaned rice were chosen randomly from the test and control plots. Grain was cleaned in a small pilot plant and the whole straw sample was treated by cutting and mixing. Sub-samples of more than 300 g of grain were then crushed to provide the analytical samples. Only the parent compound was determined. The average recovery was 76.4% from straw and 72.8% from rice. The residues in the straw were much higher than in the rice.
The results from Spain and Japan are summarized in Table 35.
Table 35. Residues of tebufenozide in rice grain and straw. Underlined residues are from treatments according to GAP.
|
Country, Location, year |
Form. |
Application |
PHI, days |
Residue, mg/kg |
Reference/comments |
|||||
|
No. |
kg ai/ha |
kg ai/hl |
tebufenozide |
Total RH-1788/RH-6595 |
||||||
|
rice |
straw |
rice |
straw |
|||||||
|
Japan, Chiba |
DL |
2 |
0.30 |
|
14 |
0.05 |
7.7 |
<0.005 |
0.32 |
Komatsu, 1992c* |
|
1992 |
|
|
|
|
21 |
0.05 |
6.0 |
<0.005 |
0.42 |
|
|
|
|
|
|
|
30 |
0.02 |
4.4 |
<0.005 |
0.42 |
|
|
|
|
|
|
|
45 |
0.01 |
5.1 |
<0.005 |
0.38 |
|
|
Japan, Akita |
DL |
2 |
0.30 |
|
14 |
0.03 |
2.2 |
<0.005 |
0.22 |
Komatsu, 1992c* |
|
1992 |
|
|
|
|
21 |
0.02 |
3.9 |
<0.005 |
0.41 |
|
|
|
|
|
|
|
30 |
0.02 |
2.8 |
<0.005 |
0.32 |
|
|
|
|
|
|
|
45 |
0.006 |
0.7 |
<0.005 |
0.12 |
|
|
Japan, Hyogo |
WP |
2 |
0.15 |
0.010 |
21 |
0.008 |
2.6 |
<0.005 |
0.2 |
Komatsu, 1992c* |
|
1992 |
|
|
|
|
30 |
0.01 |
2.4 |
<0.005 |
0.08 |
|
|
|
|
|
|
|
45 |
0.006 |
2.9 |
<0.005 |
0.1 |
|
|
Japan, Ohita |
WP |
2 |
0.10 |
0.010 |
21 |
0.07 |
6.2 |
0.006 |
0.2 |
Komatsu, 1992c* |
|
1992 |
|
|
|
|
30 |
0.08 |
5.9 |
0.008 |
0.1 |
|
|
|
|
|
|
|
45 |
0.05 |
3.1 |
0.008 |
0.1 |
|
|
Japan, Tokushima |
WP |
2 |
0.25 |
0.010 |
20 |
0.06 |
|
|
|
Komatsu, 1992c |
|
1991 |
|
|
|
|
30 |
0.03 |
|
|
|
|
|
|
|
|
|
|
45 |
0.01 |
|
|
|
|
|
Japan, Tochigi |
WP |
2 |
0.15 |
0.010 |
21 |
0.007 |
|
|
|
Komatsu, 1992c |
|
1992 |
|
|
|
|
30 |
0.01 |
|
|
|
|
|
|
|
|
|
|
45 |
0.01 |
|
|
|
|
|
Japan, Hiroshima |
DL |
2 |
0.30 |
|
14 |
0.02 |
|
|
|
Komatsu, 1992c |
|
1991 |
|
|
|
|
21 |
0.02 |
|
|
|
|
|
|
|
|
|
|
30 |
0.01 |
|
|
|
|
|
|
|
|
|
|
45 |
0.01 |
|
|
|
|
|
Japan, Hyogo |
DL |
2 |
0.30 |
|
14 |
<0.005 |
|
|
|
Komatsu, 1992c |
|
1992 |
|
|
|
|
21 |
<0.005 |
|
|
|
|
|
|
|
|
|
|
30 |
<0.005 |
|
|
|
|
|
|
|
|
|
|
45 |
<0.005 |
|
|
|
|
|
Spain 1992 |
SC |
1 |
0.24 |
0.012 |
37 |
0.06 |
0.82 |
|
|
Mellet, 1993b |
|
Spain 1992 |
SC |
1 |
0.24 |
0.012 |
54 |
0.02 (Brown rice also 0.02) |
1.23 |
|
|
Mellet, 1993b |
DL: Dustless
* Official trial
