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					Interim Research Report Submitted to Delaware Soybean Board

       WEED CONTROL IN CONVENTIONAL NO-TILLAGE SOYBEANS


Submitted by

Mark VanGessel
Extension Specialist / Assoc. Professor
University of Delaware
16684 County Seat Highway
Georgetown, DE 19947
Phone: 302/ 856-7303 (ext 510) Fax: 302/ 856-1845
e-mail: mjv@udel.edu
The following are two field trials with a justification for each and a brief
methodology.


1. Conventional (non-RR) Soybean Weed Control Under No-till Conditions

The objective of this study is to examine a range of herbicide programs for weed
control under no-till conditions focusing on replacements for Canopy and Canopy
XL. Treatments are listed in Table 1.

2. Utility of Valor for Delaware Soybean Producers

The objective of this study is to identify utility of Valor for Delaware soybean
producers. Treatments are listed in Table 2

Methods:

       Soybeans (Southern States 381STS) were planted on May 19, 2006 at
UD-REC into small grain stubble. Entire experimental area was treated with
paraquat prior to planting to control winter annual weeds. Preemergence
herbicides were applied immediately after planting. Selected treatments received
postemergence herbicides which were applied 3 weeks after planting.

        The research site did not receive precipitation for thirteen days following
preemergence herbicide application, which resulted in poor weed control. As a
result, a second site (Asbury Church site) was planted on June 6. The same
variety was used for the non-RR trial while RT4502N was used for the Valor
study. The weed density was low and species were variable at the second site
resulting in poor data.


Preliminary observations:

Non-RR trial. Preemergence herbicides provided poor weed control at UD-REC.
Postemergence treatments were generally very effective when rated 4 weeks
after treatment. At neither location was any herbicide injury observed.

Valor trial: Valor applications were generally fair to good for common
lambsquarters, and common ragweed control. Morningglory control was poor
with Valor. At neither location was any herbicide injury observed.


Late season ratings and yield have not been collected for these trials.




                                                 VanGessel: Soybean Weed Control - 2
VanGessel: Soybean Weed Control - 3
Table 1. Treatments for non-Roundup Ready Soybeans

Trt     Treatment          Form Form Product Product        Grow
No.     Name               Conc Type Rate    Rate Unit      Stg
    1   Untreated Check
    2   Sencor                 75   DF        4   oz wt/A   PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
   3    Lorox                  50   DF      0.5   lb/A      PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
   4    Sencor                 75   DF        4   oz wt/A   PRE
        Lorox                  50   DF      0.5   lb/A      PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
   5    Boundary              6.5   EC     1.25   pt/A      PRE
   6    Canopy SP            58.3   DG        4   oz wt/A   PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
   7    Sencor                 75   DF        4   oz wt/A   PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
   8    Lorox                  50   DF      0.5   lb/A      PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
   9    Lorox                  50   DF      0.5   lb/A      PRE
        Sencor                 75   DF        4   oz wt/A   PRE
        Dual II Magnum       7.64   E         1   pt/A      PRE
  10    Valor                  51   WG        2   oz/A      PRE
        Synchrony XP         28.4   DG     0.75   oz wt/A   POST
  11    Dual II Magnum       7.64   E         1   pt/A      PRE
        Synchrony XP         28.4   DG     0.75   oz wt/A   POST
  12    Dual II Magnum       7.64   E         1   pt/A      PRE
        Lorox                  50   DF      0.5   lb/A      PRE
        Synchrony XP         28.4   DG     0.75   oz wt/A   POST
  13    Synchrony XP         28.4   DG     0.75   oz wt/A   POST




                                         VanGessel: Soybean Weed Control - 4
Table 2. Treatments to evaluate utility of Valor

                          For
Trt   Treatment               Form Product Product         Grow
                          m
                          Con
No. Name                      Type Rate    Rate Unit       Stg
                          c
   1 Untreated Check
   2 Valor                  51   WG          2   oz/A      PRE
     Lorox                  50   DF          1   lb/A      PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
   3 Valor                  51   WG          2   oz/A      PRE
     Sencor                 75   DF          4   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
   4 Valor                  51   WG          2   oz/A      PRE
     Lorox                  50   DF          1   lb/A      PRE
     Sencor                 75   DF          4   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
   5 Valor                  51   WG          2   oz/A      PRE
     Boundary              6.5   EC       1.25   pt/A      PRE
   6 Valor                  51   WG          2   oz/A      PRE
     Canopy SP            58.3   DG          5   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
   7 Valor                  51   WG          2   oz/A      PRE
     Firstrate              84   WG        0.5   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
   8 Valor                  51   WG          3   oz/A      PRE
     Canopy SP            58.3   DG          5   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
   9 Valor                  51   WG          3   oz/A      PRE
     Lorox                  50   DF          1   lb/A      PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
  10 Lorox                  50   DF          1   lb/A      PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
  11 Sencor                 75   DF          4   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
  12 Lorox                  50   DF        0.5   lb/A      PRE
     Sencor                 75   DF          4   oz wt/A   PRE
     Dual II Magnum       7.64   E           1   pt/A      PRE
  13 Boundary              6.5   EC       1.25   pt/A      PRE
  14 Canopy SP            58.3   DG          5   oz wt/A   PRE




                                              VanGessel: Soybean Weed Control - 5

				
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