North Dakota State University

NDSU
North Central Research Extension Center
Brian Jenks
Weed Scientist
bjenks@ndsuext.nodak.edu
 
Denise Markle
Research Specialist
dmarkle@ndsuext.nodak.edu		 Gary Willoughby
Research Specialist
gwillough@ndsuext.nodak.edu
5400 Highway 83 South
Minot, ND  58701-7662
701.857.7679
701.857.7676 (fax)
Wild Oat Control in Imidazolinone Tolerant Canola (1998)
IMI-tolerant canola was seeded on May 15 at 700,000 plants per acre.  Seed bed preparation was conventional with six-inch row spacing.  Treatments consisted of preplant incorporated, early-post (June 8), and late-post (June 22) applications.  On June 8 canola was 2 to 3-leaf, wild oat was 4-leaf.  On June 22 canola was 4 to 5-leaf, wild oat was 6-leaf.  Wild oat (Wioa) control was evaluated on July 5 and August 12.  The canola was harvested August 19.

7-5 8-12
Treatment  Rate Wioa Wioa Yield
--% Control-- lb/A
Treflan 1.5 pt/A 75 68 1025
Treflan  / 1.5 pt/A  / 80 68 1182
   Herbicide 273    1.5 pt/A
Treflan  / 1.5 pt/A / 99 96 1553
   Motive + COC + 28% N    2 fl oz/A + 1.25% + 1.25% 
Treflan  / 1.5 pt/A  / 98 99 1472
   Motive + COC + 28% N    4 fl oz/A + 1.25% + 1.25% 
Treflan  /  1.5 pt/A  /  72 73 1068
   DPX-M6316 + COC    0.023 lb A/A + 1.25%
Motive + COC + 28% N 2 fl oz/A + 1.25%  + 1.25%  95 98 1509
Motive + SURF + 28% N 2 fl oz/A + 0.25%  + 1.25%  89 88 1264
Motive + COC + 28% N 4 fl oz/A + 1.25%  + 1.25%  94 96 1299
Motive + SURF + 28% N 4 fl oz/A + 0.25% + 1.25%  95 95 1441
Motive + COC + 28% N 5 fl oz/A + 1.25%  + 1.25%  96 99 1367
Motive + SURF + 28% N 5 fl oz/A + 0.25%  + 1.25%  97 98 1524
Poast + 1 pt/A + 95 98 1376
   Motive + COC + 28% N    2 fl oz/A + 1.25%  + 1.25% 
Poast + 1 pt/A + 96 99 1175
   Motive + COC + 28% N    4 fl oz/A + 1.25%  + 1.25% 
Poast + 1 pt/A + 95 97 1466
   Stinger + COC + 28% N    0.5 pt/A + 1.25%  + 1.25% 
Assure II + DPX-M6316 + SURF 8 fl oz/A + 0.023 lb A/A + 0.25%  89 88 1182
Motive + COC + 28% N (II) 4 fl oz/A + 1.25%  + 1.25%  88 99 1164
Motive + SURF + 28% N (II) 4 fl oz/A + 0.25%  + 1.25%  85 98 1005
Motive + COC + 28% N (II)  5 fl oz/A + 1.25%  + 1.25%  90 99 1151
Motive + SURF + 28% N (II) 5 fl oz/A + 0.25% + 1.25%  89 99 1042
Hand-weeded  / 98 98 1649
   Treflan  /    1.5 pt/A  /
   Motive + SURF + 28% N    4 fl oz/A + 0.25% + 1.25% 
Weedy Check 0 0 596
Weedy Check 0 0 585
CV 6 6 13
LSD (0.05) 8 8 272

Soil conditions were very dry for the first 30 days after seeding (0.5 inch precip).  We received 8 inches of rainfall the remainder of the growing season.  Flea beetle population was high during the dry period and damage was significant.  Postemergence treatments were delayed due to cold temperatures and high winds.  No crop injury or maturity differences were observed.  All Motive treatments provided good wild oat control.  However, yields were much higher when Motive was applied to smaller wild oat compared to larger wild oat.  Canola yields were much higher when early-season wild oat competition was reduced with Treflan, Treflan + Motive, or Motive applied early-post.  Although they appeared less competitive, a light population of ALS-resistant kochia was present in the plots and were standing above the crop at the end of the season.

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Last Updated: Thursday, May 27, 2004 02:49:18 PM
Published by North Dakota State University