Cotton (Table 31). Teflubenzuron is registered for use on cotton in Argentina (2 x 0.011 kg ai/ha, 21-day PHI), Brazil (0.0075-0.1 kg ai/ha, PHI 30 days), Paraguay (2-3 x 0.0075 kg ai/ha, PHI 30 days), Colombia (2 x 0.019 kg ai/ha), Ecuador (2 x 0.019-0.045 kg ai/ha) and Guatemala (2-3 x 0.075 kg ai/ha).
Residue trials were conducted in Brazil (4), Guatemala (2), Mexico (1) and the USA (one study with various rates and concentrations). The residues in the seed were <0.01 mg/kg after 31 days from 2 x 0.03 or 0.06 kg ai/ha in Brazil, and <0.05 mg/kg at 6-8 days from 14-15 x 0.039 kg ai/ha in Guatemala and 12 x 0.06-0.08 kg ai/ha at 18 days in Mexico. In the US trials the residues were <0.05, 0.07, 0.08, 0.11, 0.24 and 13 mg/kg, and 0.78, 3.1 and 4.6 mg/kg after the application of 12 x 0.045 and 12 x 0.45 kg ai/ha, respectively, at 14 or 18 days after treatment.
Table 31. Residues of teflubenzuron in cotton from supervised trials. Seed analysed.
|
Country, year |
Application |
PHI, days |
Residues, mg/kg |
Report No. |
||
|
kg ai/hl |
kg ai/ha |
No. |
||||
|
Brazil, 1989 |
0.012 |
0.03 |
2 |
31 |
0.01 |
SHGR.90.019 |
|
Brazil, 1989 |
0.024 |
0.06 |
2 |
31 |
<0.01 |
SHGR.90.019 |
|
Brazil, 1989 |
0.012 |
0.03 |
2 |
30 |
<0.01 |
SHGR.90.019 |
|
Brazil, 1989 |
0.024 |
0.06 |
2 |
30 |
<0.01 |
SHGR.90.019 |
|
Guatemala, 1984 |
0.14 |
0.039 |
14 |
6 |
<0.05 |
GTM84I00301 |
|
Guatemala, 1985 |
0.14 |
0.039 |
15 |
8 |
0.05 |
GTM85I00101 |
|
Mexico, 1984 |
0.30-0.40 |
0.06-0.08 |
12 |
18 |
0.05 |
MEX84I00101 |
|
USA, 1987
|
0.012 |
0.045 |
|
14 |
0.11 |
HAS A025.001
|
|
0.012 |
0.045 |
|
14 |
0.24 |
||
|
0.12 |
0.45 |
|
14 |
3.1 |
||
|
0.048 |
0.045 |
12 |
14 |
<0.05 |
||
|
0.048 |
0.045 |
12 |
14 |
0.08 |
||
|
0.48 |
0.45 |
12 |
14 |
0.78 |
||
|
0.019 |
0.045 |
12 |
18 |
0.07 |
||
|
0.019 |
0.045 |
12 |
18 |
13 |
||
|
0.19 |
0.45 |
12 |
18 |
4.6 |
||
Coffee beans (Table 32). The only registered uses of teflubenzuron on coffee are in Brazil (0.038 kg ai/ha) and Kenya (1-2 x 0.11 kg ai/ha) at PHIs of 30 days in both countries. In two residue trials in Brazil, 2 applications of 0.075 or 0.15 kg ai/ha gave residues of 0.6 and 1.7 mg/kg respectively, after 35 days.
Table 32. Residues of teflubenzuron in coffee beans from supervised trials, Brazil, 1989.
|
Application |
PHI, days |
Residues, mg/kg |
Report No. |
||
|
kg ai/hl |
kg ai/ha |
No. |
|||
|
0.01 |
0.075 |
2 |
35 |
0.60 |
SHGR.90.018 |
|
0.02 |
0.15 |
2 |
35 |
1.7 |
SHGR.90.018 |
