| Efficacy and crop tolerance to quizalofop/ethametsulfuron
combinations in canola. (1998) Canola was seeded
May 15 into 6-inch rows at 700,000 pls/A in a conventional tillage system.
Herbicide treatments consisted of a single application timing for grass
control in canola. Individual plots were 10 by 30
ft and were arranged in a RCBD with three replications. Postemergence treatments
were applied with 8001 flat fan nozzles delivering 10 gpa at 40 PSI.
Canola was harvested with a small plot combine on August 18.
Soil conditions were very dry for the first 30 days after seeding (0.5 inch
precip). We received 8 inches of rainfall the remainder of the growing season.
Flea beetle population was high during the dry period and damage was
significant. No crop injury or maturity differences due to herbicide treatments
were observed. Wild oat control with quizalofop
alone was excellent (>96%) at both evaluations. Wild oat control was reduced
slightly (5-10%) when quizalofop was tankmixed with ethametsulfuron. Increasing
the quizalofop rate to overcome antagonism did not significantly raise percent
weed control or canola yields in this study.
| Application date |
June 8 |
| Application timing |
POST |
| Temperature (F) |
|
| Air |
60 |
| Soil |
57 |
| Soil moisture |
dry |
| Relative humidity (%) |
60 |
| Canola stage |
3-leaf |
| Wild oat stage |
4-leaf |
Table. Efficacy and crop tolerance to
quizalofop/ethametsulfuron combinations in canola.
|
|
July
7 |
August
10 |
Aug 18 |
| Treatment |
Rate |
Wioa |
Wioa |
Yield |
|
lb/A |
---------- %
Control--------- |
lb/A |
| quizalofop + COC |
0.055 + 1% |
96 |
99 |
1381 |
| quizalofop + COC |
0.07 + 1% |
97 |
99 |
1364 |
| ethametsulfuron + COC |
0.014 + 1% |
66 |
73 |
1284 |
| quizalofop + ethametsulfuron +
COC |
0.055 + 0.014 + 1% |
86 |
95 |
1345 |
| quizalofop + ethametsulfuron +
COC |
0.07 + 0.014 + 1% |
89 |
92 |
1413 |
| untreated |
|
0 |
0 |
488 |
|
|
|
|
|
| CV |
|
11 |
8 |
14 |
| LSD (0.05) |
|
14 |
12 |
305 |
COC = Herbimax by Loveland
| 
