|
Timing of weed control in Clearfield Canola (2001)
Clearfield canola (46A76) was seeded May 4 into 6-inch rows at 700,000 pls/A
in a conventional tillage system. Individual plots were 10 x 30 ft and
replicated three times. Treatments were applied preplant incorporated (PPI) on
May 2, or postemergence on May 25 (0-2 lf), June 2 (3-4 lf), or June 8 (5-6 lf).
The primary weeds were green foxtail (Grft) and wild oat (Wioa).
| |
|
|
Jun 26 |
Aug 14 |
| Treatmenta |
Rate |
Timing |
Injury |
Grft |
Wioa |
Yield |
Test wt. |
| |
|
|
— % — |
— % control — |
lb/A |
lb/bu |
| Treflan |
1.5 pt |
PPI |
0 |
|
|
2429 |
50.5 |
| Treflan / Assure II |
1.5 pt / 8 fl oz |
PPI / 3-4 lf |
0 |
98 |
97 |
2173 |
50.5 |
| Sonalan |
2 pt |
PPI |
0 |
|
|
2281 |
50.6 |
| Sonalan / Assure II |
2 pt / 8 fl oz |
PPI / 3-4 lf |
0 |
98 |
98 |
2474 |
50.9 |
| Treflan / Raptor |
1.5 pt / 2 fl oz |
PPI / 3-4 lf |
0 |
96 |
93 |
2339 |
50.9 |
| Sonalan / Raptor |
2 pt / 2 fl oz |
PPI / 3-4 lf |
0 |
97 |
96 |
2373 |
50.9 |
| Raptor |
2 fl oz |
0-2 lf |
0 |
92 |
90 |
2425 |
50.8 |
| Raptor |
2 fl oz |
3-4 lf |
0 |
92 |
90 |
2428 |
50.7 |
| Raptor |
2 fl oz |
5-6 lf |
0 |
89 |
85 |
2340 |
50.4 |
| Raptor |
4 fl oz |
0-2 lf |
0 |
95 |
94 |
2366 |
50.7 |
| Raptor |
4 fl oz |
3-4 lf |
0 |
95 |
95 |
2247 |
50.8 |
| Raptor |
4 fl oz |
5-6 lf |
0 |
94 |
92 |
2149 |
50.6 |
| Raptor / Raptor |
2 fl oz / 2 fl oz |
0-2 lf / 5-6 lf |
0 |
98 |
98 |
2392 |
51.1 |
| Raptor / Raptor |
1 fl oz / 1 fl oz |
0-2 lf / 5-6 lf |
0 |
96 |
96 |
2472 |
51.0 |
| Weedy check |
|
|
0 |
0 |
0 |
1856 |
50.1 |
| LSD |
|
|
-- |
4 |
5 |
318 |
NS |
| CV |
|
|
0 |
2 |
3 |
8 |
1.0 |
a All Raptor treatments were applied with 0.25%
NIS and 1 qt 28% UAN.
The study area had a very low population of wild oat and a moderate
population of green foxtail. All treatments provided good to excellent control
of green foxtail and wild oat at any rate or timing. None of the treatments
caused visible crop injury. The treatments increased canola yield 200-600 lb/A
over the untreated check. The canola crop was very competitive with the weeds,
thus allowing even the reduced herbicide rates to be effective. The labeled use
rate of Raptor is 4 fl oz/A. Higher weed densities and non-ideal spraying
conditions may result in unacceptable weed control from reduced herbicide rates.
Back to North
Central Research Extension Center
Back to NDSU Agriculture
Brian Jenks
| 