Herbicide Resistant Weed Maps
This post will serve as a primary resource for the status of herbicide resistant weeds along with testing services and expertise provided to Ontario agriculture. […]
Category: Weeds
Weed Inspectors Conference 2017
The annual weed inspectors conference is scheduled for Thursday April 12th, 2018 at the Victoria East Golf Course, Guelph, Ontario. The cost is $75 (HST included) and includes morning snacks, lunch and resource material. The objective of this conference is to provide an overview of the Weed Control Act, administrative and enforcement duties conducted by weed […]
Steel in the field
I recently was asked if I knew of any good resources for farmers wishing to reduced herbicide use or transition to organic production. My favourite is called “Steel in the field – a farmer’s guide to weed management tools” Edited by Greg Bowman and published by the Sustainable Agriculture Network. If you want a print […]
Herbicide Injury Scenarios in Soybean – 2015 Ridgetown Diagnostic Days
Below are 10 herbicide injury scenarios applied to 4 different soybean varieties, specifically, Liberty Link (glufosinate tolerant), Enlist (glufosinate, glyphosate and 2,4-D tolerant), Xtend (glyphosate and dicamba tolerant) and Roundup Ready (glyphosate tolerant). Since it is possible that both Enlist and Xtend varieties may be available for the 2016 growing season, one of the main […]
Re-Spraying Weeds in Non-GMO soybeans
Dealing with weed escapes in non-GMO or “identity preserved” soybeans can be challenging because many of the herbicides available don’t control a large spectrum of weeds nor will the handle larger weeds the way that glyphosate does in a glyphosate tolerant (RR) soybean crop. I have summarized the performance of several post-emergence herbicides for non-GMO […]
Canada fleabane control pre-plant in soybean
There is some confusion on the approach for managing glyphosate resistant Canada fleabane in soybeans. I provide two scenarios that have been often asked this past winter and their solutions based on the learnings of Dr. Peter Sikkema’s applied research program out of the University of Guelph (Ridgetown campus). Scenario # 1: No-till soybeans with […]
Herbicide Injury Identification – Resources
Here are some resources that will be helpful in the identification of crop injury caused by herbicides. Classes of herbicide injury according to their location on the plant (begins on page 280) Below is an archive of diagnostic day scenarios. 2015 Herbicide Injury Scenarios 2014 Herbicide Injury Scenarios 2013 Herbicide Injury Scenarios 2012 Herbicide Injury […]
Herbicide Injury Scenarios in Corn – Ridgetown Diagnostic Day (2014)
The following 10 herbicide injury scenarios in corn were presented at the South West Crop Diagnostic Days on July 9th and 10th, 2014. Each scenario contain 2 corn hyrbids. One that had tolerance to glyphosate (e.g. Roundup) and glufosinate (e.g. Liberty). The other was an Enlist hybrid, that had tolerance to glyphosate (e.g. Roundup), glufosinate (e.g. Liberty), phenoxy herbicides […]
Permit herbicide – Guidelines for use in field corn
The recent registration of Permit (active ingredient: halosulfuron) in Ontario provides a nice tool for the management of yellow nutsedge in corn. Permit will also provide residual control of certain broadleaf weeds. For those two reasons, many growers will consider tank-mixing glyphosate and Permit for use in glyphosate tolerant corn. Here are 5 key points to consider when […]
Recurring weed control questions
Find below recurring questions I’ve been asked lately and my response. Q: Do you have a list of new soybean herbicides with details of what they are, what they control and when they should be applied? A: Find a summary that includes a weed control rating table here: New Soybean Herbicide Comparisons 2014_Final Q: How does […]
STOP DRIFT BEFORE IT STARTS
Pesticide spray drift is the aerial movement and unintentional deposit of pesticide outside the target area. Spray drift has many negative impacts, including: less product being deposited on the target, resulting in reduced efficacy financial loss associated with wasted pesticide and time the risk of damage to human health, susceptible plants (e.g. adjacent crops), non-target […]
Can volunteer red clover be managed in soybeans?
When fall management fails to eliminate a red clover cover crop what are the options to manage it ahead of soybeans? Ideally one should plant the field to corn and take advantage of red clover’s nitrogen credit (The Ontario corn nitrogen calculator credits it for as much as 73 lbs N/ac). Planting corn also provides […]
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 not provide acceptable control […]
Wild Parsnip Control
Wild parsnip is a common weed in eastern Ontario, and is spreading in many other parts of the province. It is a biennial, or short-lived perennial (Figure 1). While wild parsnip does not have the notoriety of giant hogweed, its sap does contain some of the same chemicals (furanocoumarins). When these compounds come in contact […]
Herbicide Injury in Soybeans: 2013 SW Diagnostic Days
The following 10 herbicide injury related scenarios where showcased at the 2013 South West Diagnostic Days held at the University of Guelph, Ridgetown Campus. These scenarios are either duplications of common mishaps that have occured in Ontario or a “look and see” based on farmer or agronomist query. It is important to point out that […]