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Broadleaf Weed Control in Field Corn with Postemergence Herbicides

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									Broadleaf Weed Control in
     Field Corn with
Postemergence Herbicides

    Richard N. Arnold
      Daniel Smeal
    Michael K. O’Neill
               Introduction

• Approximately 83,000 acres and
  50,000 acres of corn are grown for
  grain or silage in New Mexico
  annually.
• Most of the corn produced whether
  silage or grain is mainly for the diary
  and livestock industries.
      Materials and Methods

• Experiments were conducted on a Wall
  Sandy loam with less than 1% OM.
• Pioneer 34M95 and 34N44 were planted on
  May 13 and 14, 2002-2003 at
  approximately 35,000 seeds/A.
• Individual plots were 4, 34 in rows 30 ft
  long.
• Randomized complete block with three
  replications.
      Materials and Methods

• Treatments were applied on June 4
  and June 2, 2002-2003 when corn
  was in the 4th leaf stage and weeds
  were small.
• Treatments were applied with a
  compressed air backpack sprayer
  calibrated to deliver 30 gal/A at 30 psi.
      Materials and Methods

• Air temperature during application
  were approximately 79 and 91
  degrees in 2002-2003.
• 8004 Flat fan nozzles.
• Herbicide treatments were applied
  with a crop oil concentrate and N-32
  at 0.5 and 1.0 percent v/v.
      Materials and Methods

• Crop injury and weed control
  evaluations were made on July 8 and
  17, in 2002-2003.
• Field corn was harvested on
  December 10 and 4, 2002-2003 by
  combining the two center rows of each
  plot using a John Deere 3300
  combine equipped with a load cell.
Russian thistle
Common lambsquarters
Prostrate pigweed
Redroot pigweed
Black nightshade
Herbicide Designations
    Trade              Chemical

   Steadfast   nicosulfuron + rimsulfuron

  DPX 79406    nicosulfuron + rimsulfuron

    Option            fenoxaprop

    Clarity            dicamba

  Marksman        dicamba + atrazine

    Distinct    diflufenzopyr + dicamba

    Callisto          mesitrione
   Weed Control Evaluations
Treatment       lb ai/A    2-year av.   2-year av.
                            % Solni      % Saskr
Steadfast       0.035         57           45


Steadfast +   0.035+0.25      99           98
   clarity

Steadfast +   0.035+0.4       99           99
marksman
Steadfast +   0.035+0.09      68           98
  distinct
Steadfast +   0.035+0.06      98           68
  callisto
    Weed Control Evaluations
 Treatment      lb ai/A    2-year av.   2-year av.
                            % Solni      % Saskr
DPX 79406       0.023         47           43

DPX 79406 +   0.023+0.25      93           98
  clarity
DPX 79406 +   0.023+0.4       97           98
 marksman
DPX 79406 +   0.023+0.09      97           98
  distinct
DPX 79406 +   0.023+0.06      99           69
  callisto
      Weed Control Evaluations
  Treatment          lb ai/A    2-year av.   2-year av.
                                 % Solni      % Saskr
    Option           0.033         87           38

Option + clarity   0.033+0.25      97           98

   Option +        0.033+0.4       99           98
  marksman
   Option +        0.033+0.09      98           98
   distinct
   Option +        0.033+0.06      98           70
   callisto
              Corn Grain Yield
Treatment        lb ai/A    2002 Yield   2003 Yield
                              bu/A         bu/A
Steadfast        0.035         219         229

Steadfast +    0.035+0.25      249         264
   clarity
Steadfast +    0.035+0.4       244         253
marksman
Steadfast +    0.035+0.09      256         277
  distinct
Steadfast +    0.035+0.06      262         267
  callisto
              Corn Grain Yield
 Treatment       lb ai/A    2002 Yield   2003 Yield
                              bu/A         bu/A
DPX 79406        0.023         229          233

DPX 79406 +    0.023+0.25      247          264
  clarity
DPX 79406 +    0.023+0.4       246          264
 marksman
DPX 79406 +    0.023+0.09      255          267
  distinct
DPX 79406 +    0.023+0.06      238          266
  callisto
              Corn Grain Yield
 Treatment      lb ai/A    2002 Yield   2003 Yield
                             bu/A         bu/A
  Option        0.033         225         234

  Option +    0.033+0.25      243         267
   clarity
  Option +     0.033+0.4      240         260
 marksman
  Option +    0.033+0.09      258         264
  distinct
  Option +    0.033+0.06      248         293
  callisto
Weedy check       0           110         143
     Weed Control and Injury
           Results

• None of the herbicides caused any
  noticeable crop injury.
• Redroot and prostrate pigweed and
  common lambsquarters control were
  good to excellent with all treatments
  except the check.
• Steadfast, DPX 79406 and Option
  applied alone gave poor control of
  Russian thistle.
      Weed Control Results

• Option gave 53 and 85 percent better
  control of black nightshade than did
  Steadfast or DPX 79406.
• Black nightshade and Russian thistle
  control increased significantly when
  Steadfast, DPX 79406, and Option
  were combined with either clarity,
  marksman, distinct, and callisto.
     Corn Grain Yield Results

• Yields were 109 to 152 and 86 to 150
  bu/A higher in the herbicide treated
  plots as compared to the check.
• Steadfast plus callisto and Option plus
  callisto were the highest yielding
  herbicide treatments of 262 and 293
  bu/A.
Steadfast at 0.035 lb ai/A
Steadfast plus Clarity
 0.035+0.25 lb ai/A
Steadfast plus Marksman
    0.035+0.4 lb ai/A
Steadfast plus Distinct
  0.035+0.09 lb ai/A
Steadfast plus Callisto
  0.035+0.06 lb ai/A
DPX 79406 0.023 lb ai/A
Option 0.033 lb ai/A
Option plus Clarity
0.033+0.25 lb ai/A
Option plus Marksman
  0.033+0.4 lb ai/A
Option plus Distinct
0.033+0.09 lb ai/A
Option plus Callisto
0.033+0.06 lb ai/A
Check
              Summary

• Steadfast, DPX 79406 and Option
  applied alone gave poor control of
  Russian thistle in 2002-2003.
• Option gave approximately 53 and 85
  percent better control of black
  nightshade than did Steadfast or DPX
  79406 in 2002-2003.
               Summary

• When Steadfast, DPX 79406 and
  Option were combined with clarity,
  marksman, distinct, or callisto, black
  nightshade and Russian thistle control
  significantly increased in 2002-2003.
• Yield were significantly better in the
  herbicide treated plots as compared to
  the weedy check in 2002-2003.
Thank You

								
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