January 2, 2020
TRIAL OBJECTIVE
This trial compared burndown control of glyphosate-resistant kochia using XtendiMax® herbicide with VaporGrip® Technology plus Roundup PowerMAX® herbicide, Enlist One® herbicide with Colex-D® Technology plus Roundup PowerMAX® herbicide, or Enlist Duo® herbicide with Colex-D® Technology.
RESEARCH SITE DETAILS
| Location | Gothenburg, NE | Planting Date | 5/15/19 |
| Soil Type | Silty Loam | Kochia Height at Application | 4 inches |
| Previous Crop | Soybean |
Nozzle | TTI 110015 |
| Tillage Type | Conventional |
Spray Volume (gallons/acre) | 15 |
- This trial was placed in an area that was planted to corn because kochia pressure was extremely high. Treatment 2, 5, and 6 are not labeled for corn and are meant for demonstration of kochia control prior to soybeans.
- Plots were 10 feet wide by 30 feet long, and each treatment was replicated three times.
UNDERSTANDING THE RESULTS
- At 14 days after application, kochia control was 94% for both treatments containing XtendiMax® herbicide with VaporGrip® Technology. Control did not exceed 82% using Enlist One® Herbicide with Colex-D® Technology or 78% using Enlist Duo® Herbicide with Colex-D® Technology for this trial (Figure 1).
At 28 days after application, kochia control exceeded 95% for both treatments containing XtendiMax herbicide with VaporGrip Technology. Control with Enlist One® Herbicide with Colex-D® Technology and Enlist Duo® Herbicide with Colex-D® Technology did not exceed 66% (Figure 2) for this trial.
For this trial, kochia control was significantly (p<0.001) greater at both application rates of XtendiMax herbicide with VaporGrip Technology than in the treatments with Enlist One® Herbicide with Colex-D® Technology and Enlist Duo® Herbicide with Colex-D® Technology.
KEY LEARNINGS
Kochia is an early emerging weed that can present challenges for burndown prior to planting corn and soybeans.
XtendiMax® herbicide with VaporGrip® Technology plus Roundup PowerMAX® herbicide provided significantly greater control of kochia when compared to Enlist One® Herbicide with Colex-D® Technology or Enlist Duo® Herbicide with Colex-D® Technology at this location in these conditions.
The ability to use dicamba for burndown prior to soybean emergence in Roundup Ready 2 Xtend® soybeans provides an advantage for kochia control.
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