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Slide 1: Weed Control Options for Corn Kendall Nichols Traill County Extension Agent February 2008
Slide 2: What are you going to use? Glyphosate (Roundup) Glyphosate Glyphosate Is this the best program?
Slide 3: Early Season Weed Control University of Wisconsin Study Roundup at 2” Weeds 74% grass & 84% broadleaf = 93% yield Roundup at 12” Weeds 95% grass & 93% broadleaf = 79% yield % yield will be dependent on available moisture and fertility
Slide 4: What is a 2” weed? A 2” weed is not seen from the road By the time you can see a weed problem from the road the weeds are at least 4” and growing rapidly. Yield is already lost at this time.
Slide 5: Why use PPI or Pre? If in a crop rotation using Roundup Ready crops frequently PPI/Pre will delay glyphosate resistance problems. All PPI & Pre herbicides are a different mode of action & Protect the Roundup Ready technology and give you more options for weed control Early season weed control protects yields.
Slide 6: PPI & Pre Herbicides Acetochlor, Metolachlor, s-metolachlor, dimethenamid Herbicide names are: Harness, Surpass, Degree, all the Dual’s, Outlook and a whole host of others. PAGE 108
Slide 7: PPI & Pre Herbicides Dinitroanilines Prowl Prowl H2O
Slide 8: PPI & Pre Herbicides ALS Python Kochia – ALS Resistant
Slide 9: PPI & Pre Herbicides HPPD (Bleaching) Balance Pro
Slide 10: PPI or Pre & Roundup Roundup has greater difficulty controlling broadleaf weeds. Which broadleaf weed might be resistant to Python? ALS resistant kochia If you have a bad Common Ragweed problem which PPI or P Pre would you use? Balance pro What are the crop restrictions on this Herbicide? Page 115 18-SB 10-SF 6-SG
Slide 11: PPI or Pre & Roundup Balance Pro has a 6 month restriction for Soybeans if ___ inches of rainfall are received after application? 15 inches (Page 115) What weed might be resistant to Prowl or Prowl H2O? Yellow Foxtail (Page 120)
Slide 12: Tank Mixes with Glyphosate -Post Tank Mixes Roundup/Dicamba Banvel, Clarity, Distinct, Status
Slide 13: Conclusion PPI or Pre is a good program and can prevent timing issues early in the growing season. But, it has to be done at a very busy time. Tank mixes will give you some residual control of weeds. Both will help to prevent glyphosate resistant weeds.
Slide 14: Conclusion Maximum yields are dependent on early season weed control.
Slide 15: Questions ??????????