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
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
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
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
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
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
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
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
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
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
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
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
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
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
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