January 3, 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 | Application 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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