Table 9-4. Corn Yield from Different
Weed Management Strategies in Glyphosate Tolerant Corn
|
Strategy
|
Pros |
Cons |
Yield (%) |
|
"Two-Pass" Glyphosate
glyphosate applied at the 3 - 4 leaf stage of corn and again
at the 7 - 8 leaf stage of corn
|
- Typically provides the best weed control and corn yields.
- Better perennial weed control.
|
- More expensive.
- Increases selection pressure of glyphosate and chance of
selecting herbicide resistant weed populations.
|
100 |
|
PRE/POST
residual herbicide applied PRE followed by flyphosate applied
at the 7 - 8 leaf stage of corn
|
- Typically provides the best weed control and corn yields.
- Multiple herbicide modes of action to manage resistant weed
populations.
- Better perennial weed control.
|
|
99 |
|
"One-Pass" tank-mix with residual herbicide
glyphosate + residual herbicide applied at the 3 - 4 leaf stage
fo corn.
|
- Only one application
- Multiple herbicide modes of action to manage resistant weed
populations.
|
- Timing too early to control manyperennial weeds.
- Reduced weed control when tank-mix partner does not provide
residual control of weed spectrum in the field.
|
97 |
|
"One-Pass" Glyphosate (Early)
glyphosate applied at the 3 - 4 leaf stage of corn
|
|
- Season long weed control not always possible.
- Weeds emerging after application can significantly reduce
yield.
|
96 |
|
"One-Pass" Glyphosate (Late)
glyphosate applied at the 7- 8 leaf stage of corn
|
|
|
90 |
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