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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 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 […]
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 […]
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 fine but if […]
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 you focus on […]
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 cereal crops imminent it is worth reviewing the […]
