Frost Damaged Corn and Post-Emergent Herbicide Applications

May 27, 2013 • Written by Mike Cowbrough
frost injury on the morning of May 27th, 2013. The third morning in a row with frost.
With three consecutive days of morning frost in many parts of the province, the two most common questions are 1) Will the corn be alright? and 2) When can I start to apply herbicides? Question 1 is answered nicely by Greg Stewart in this story (the abbreviated version is that things will be ... Continue reading →
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Can I Apply Post-Emergent Herbicides to Soybeans Before the 1st Trifoliate Stage?

May 22, 2013 • Written by Mike Cowbrough
Can I Apply Post-Emergent Herbicides to Soybeans Before the 1st Trifoliate Stage?
co-authors: Dr. Clarence Swanton and Dr. Francois Tardif You may be faced with a scenario where there is an abundance of weeds at or near the maximum leaf-stage for effective control, yet the soybean crop is not at the growth stage specified on the product label. As a producer or consultant, do y... Continue reading →
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Canada fleabane control in winter wheat

April 16, 2013 • Written by Mike Cowbrough
Canada fleabane size on May 24th, 2011. This is beyond the ideal stage to effectively manage with either herbicides or tillage.
With an increase in the number of confirmed populations of glyphosate resistant Canada fleabane in Ontario, many are looking for ways to control these populations and to eliminate any seed production. Management options in soybeans have been discussed in an earlier post, but with weed control in cer... Continue reading →
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Herbicide resistant weed testing: University of Guelph lab results, 2013

April 10, 2013 • Written by Mike Cowbrough
Herbicide resistant weed testing: University of Guelph lab results, 2013
Below is a summary of all weed samples sent into the University of Guelph by producers and agronomists that suspected resistance to a particular herbicide during the 2012 season. Also included are herbicide options with different modes of action that are effective on each species. The latest summary... Continue reading →
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Posted in Corn, Pest Management, Soybeans | Leave a comment

Peter Johnson recognized by the Oxford County Federation of Agriculture

April 5, 2013 • Written by Mike Cowbrough
Peter Johnson recognized by the Oxford County Federation of Agriculture
Congratulations to Peter Johnson for winning the President’s Technology Award at the Oxford County Federation of Agriculture “Agriculture Awards of Excellence 2013” ceremony held on April 3rd. This award recognizes an individual, business, farm operation or organization that shows initiativ... Continue reading →
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Posted in Cereals | 1 Comment

Weed Inspectors Conference 2013

March 28, 2013 • Written by Mike Cowbrough
Knapweed
The annual weed inspectors conference is scheduled for Wednesday April 17th, 2013 at the Victoria East Golf Course, Guelph, Ontario. The objective of this conference is to provide an overview of the Weed Control Act, the adminstrative and enforcement duties conducted by weed inspectors and to pro... Continue reading →
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WEED ID QUIZ #1

March 22, 2013 • Written by Mike Cowbrough
Weed ID quiz
Getting good at weed identification simply involves repetition by seeing a species in different environments. In an attempt to raise your level of weed identification skills, I will be putting out a series of weed ID quizes during the growing season comprised of pictures from the field. In the inter... Continue reading →
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Chickweed infesting an Alfalfa crop – What to do?

March 14, 2013 • Written by Mike Cowbrough
STEME_mature
How do you control chickweed in alfalfa? It is a question asked annually.  If you don't know what chickweed is search it on google images. Of course there is always www.weedinfo.ca. There are three main points on chickweed infesting an alfalfa crop that I have learned over the years. Any herb... Continue reading →
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Why pre-plant herbicides are so critical in soybean production

February 5, 2013 • Written by Mike Cowbrough
Why pre-plant herbicides are so critical in soybean production
If you grow soybeans and have had all or either of Canada fleabane, common ragweed and giant ragweed growing in your fields, the use of pre-plant herbicide tank-mixes will be your best chance at achieving good control of these weeds. Management options for these three weeds are either limited or do ... Continue reading →
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Should ammonium sulfate be added to glyphosate?

December 5, 2012 • Written by Mike Cowbrough
Should ammonium sulfate be added to glyphosate?
It seems to be an annual question. Do I add ammonium sulfate (AMS) to glyphosate? Will it improve weed control especially if my water source is hard? The short answer is no. Skeptical? I understand. There are many areas within the United States that insist the addition of ammonium sulfate (AMS) t... Continue reading →
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2,4-D Ester now registered for use pre-plant in soybean to control glyphosate resistant giant ragweed

October 4, 2012 • Written by Mike Cowbrough
a pre-plant application of glyphosate + 2,4-D Ester 700 (left) is adequately controlling giant ragweed in soybean that is resistant to glyphosate (right)
Soybean growers in Ontario now have an approved option for controlling glyphosate resistant giant ragweed (Ambrosia trifida), a species that can reduce yields by over 50%. The pre-plant application of 2,4-D Ester 700 (pcp #27820, NuFarm) was recently granted a user requested minor use label expansi... Continue reading →
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Fall Control of a Red Clover Cover Crop

September 27, 2012 • Written by Mike Cowbrough
Fall Control of a Red Clover Cover Crop
A beautiful stand of  red clover can provide as much as 75 kg of nitrogen per hectare (when at 40 cm tall) for next years corn crop. However, if the clover crop is not "killed off"  in the fall, then preparing a suitable seedbed to plant next years crop in is often significantly delayed resulting ... Continue reading →
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Using Pre-Harvest Herbicides in Soybeans

August 22, 2012 • Written by Mike Cowbrough
co-written by Horst Bohner When poor herbicide performance or late seed germination results in unacceptable amounts of weeds in a soybean crop, a pre-harvest herbicide treatment will aid in a quicker, more efficient harvest. Drier plant matter will pass more easily through the combine and will resu... Continue reading →
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Herbicide Injury in Corn and Soybean, FarmSmart Expo 2012

July 13, 2012 • Written by Mike Cowbrough
Herbicide Injury in Corn and Soybean, FarmSmart Expo 2012
Below are examples of corn and soybean injury demonstrated at the FarmSmart field expo, July 12, Elora Research Station (University of Guelph) Scenario 1: Just this past spring, I had contact with a producer who had accidentally applied Guardian Plus (glyphosate + chlorimuron + flumioxazin) post em... Continue reading →
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Herbicide Injury Scenarios in Corn – Diagnostic Day Plots

July 3, 2012 • Written by Mike Cowbrough
Injury caused by a post emergent application of isoxaflutole/atrazine without the crop safener
Below is an overview of herbicide injury scenarios presented at the SouthWest Crop Diagnostic Days . Scenario 1: A field of corn has been replanted due to a poor stand. After planting the producer has decided to remove the existing stand as it is effectively a weed to the new crop. Unfortunately... Continue reading →
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Author

Mike Cowbrough

Areas of Focus
• Weed management systems for field crops
• Editor of Guide to Weed Control Publication 75
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