Field Demonstrations for Fall Soybean Herbicide Applications

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

UD Weed Science Program established two locations for fall soybean herbicide applications in 2008 (last fall) and you are invited to stop and evaluate them. One location is in New Castle County (just north of Middletown) at the UD Demonstration Site on Marl Pit Road. The second location is in Sussex County near the UD Research and Education Center on Waller Road. This project is funded by the Delaware Soybean Board. Detailed directions to the sites are available here: http://www.rec.udel.edu/Update09/HerbicideDemo.pdf.

Last fall the following treatments were applied to plots 30 feet wide and at least 150 feet long. The treatments were:

Glyphosate + 2,4-D in the fall
Glyphosate + 2,4-D + Canopy EX (2 oz wt/A)
Glyphosate + 2,4-D + Canopy EX (1.35 oz wt/A)
Glyphosate + 2,4-D + Valor XLT (4.5 oz wt/A)
Glyphosate + 2,4-D + Valor XLT (3.0 oz wt/A)

These treatments were chosen based on 3 to 4 years of trials with small plot research. Initial control (burndown control) was excellent for all treatments and differences between treatments are due to residual control of Canopy EX or Valor XLT.

These plots are at a stage that is good to compare the treatments. There are signs describing the treatments and information on timing of application is in the box at the UD signs. Please stop by over the next week to evaluate the plots for yourself. Complete the questionnaire that is located in the boxes as well.

Questions or comments may be directed to Mark VanGessel, UD Extension Weed Science at
(302) 856-2585 ext 305

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