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For IP and Roundup Ready soybeans, the message on Canada fleabane is simple: control it early.
Crops

The one-two weed punch farmers are up against

Managing Canada fleabane and waterhemp is an ongoing challenge for IP and Roundup Ready soybean growers

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Reading Time: 4 minutes The invasion continues. From 2010 to 2015, glyphosate-resistant Canada fleabane spread from Windsor to the Quebec border — more than 800 kilometres in just six years. Along the way, it evolved resistance to Groups 2 and 9 modes of action. Waterhemp has also spread rapidly, with biotypes resistant to Groups 2, 4, 9, 14 and […] Read more
While corn is generally more sensitive to yield loss from weeds, soybeans are more sensitive to Canada fleabane. In field trials, Peter Sikkema found the average yield loss in soybean to be 61 per cent versus 52 per cent in corn.
Corn, Crops

The Canada fleabane problem

At current corn and soybean prices, the value of control is at an all-time high

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Reading Time: 4 minutes If you think you’ve heard the same message about glyphosate-resistant Canada fleabane more than once, you’re probably right. But that doesn’t mean you should pay less attention, especially since it’s particularly important if you’re growing corn. The problem of resistant biotypes isn’t getting much better, says Peter Sikkema, weed scientist with University of Guelph’s Ridgetown […] Read more
Figure 1 (left). A bolted Canada fleabane plant the day following a frost event where nighttime temperatures reached -3.3 C; Figure 2 (right). The same bolted Canada fleabane plant the following spring (March 2021).
Crops

Pest Patrol: Canada fleabane in an organic hay crop

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 2 minutes Q: I have a lot of Canada fleabane in my organic hay crop. Is it a problem to feed? How do I get rid of it? It’s not great to have Canada fleabane in your hay crop. It’s an alternative host for plant feeding insects such as tarnished plant bug, and the leaves have irritated […] Read more
Waterhemp is now resistant to seven modes of action and is also showing signs of metabolic-based resistance.
Crops

New threat to weed management

Metabolic-based resistance is setting off alarms south of the border. There won’t be any easy answers

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Reading Time: 6 minutes Here in the 2020s, herbicide resistance seems just part of the reality of managing weeds. It’s certainly not a new topic. We faced resistance to atrazine in the 1970s, then Group 2 ALS inhibitors in the 1990s and a more recent, widespread resistance to glyphosate. But of course the resistance threat keeps getting more complicated: […] Read more
Canada fleabane rosette during October.
Crops

Pest Patrol: Management practices that controlled glyphosate-resistant weeds in 2020

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 3 minutes Several Ontario agronomists recently shared their most successful strategies for managing glyphosate-resistant weeds. Four general strategies were identified: 1. Inclusion of winter wheat in the crop rotation By early spring, winter wheat’s dense ground cover does not provide a good environment for annual weeds, like waterhemp, to germinate. There are also many herbicides that are […] Read more
Figure 1. Canada fleabane leaf injury caused by 28 per cent UAN.
Crops

Pest Patrol: Using 28 per cent to manage Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 3 minutes I’m thankful that farmers and agronomists share their ideas, experiences and questions with me as it relates to killing weeds. During the winter months I’ll test out ideas in the greenhouse to see if they’re worth taking to the field. I’m fortunate that we have some great public-sector researchers (such as Dr. Page, Dr. Sikkema […] Read more
Figure 4: Waterhemp in soybean.
Crops

Pest Patrol: Dealing with waterhemp and Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 3 minutes In last month’s #PestPatrol, we discussed options for the control of glyphosate-resistant waterhemp. However, across the province, there appears to be a more immediate threat for the 2020 season from glyphosate-resistant Canada fleabane. This article will focus on management strategies to control both species at the same time. It is true that glyphosate-resistant Canada fleabane […] Read more
Trying to overcome Canada fleabane via breeding is the target of many researchers and breeders.
Crops

Better herbicide tolerance

Better technologies are coming, but we’ll need patience and shrewd management until they arrive

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Reading Time: 4 minutes Count off the many challenges facing a farmer in any growing season and outside of weather conditions, the biggest impediment has to be weed management, particularly as it relates to herbicide tolerance. In spite of the importance of varietal or hybrid selection and fertility, and the potential for yield losses from insect pests and diseases, […] Read more
Pre-plant applications of dicamba at the high rate and to emerged fleabane rosettes have provided the most effective control of glyphosate-resistant Canada fleabane (left) compared to an unsprayed strip (right) when planting Xtend soybean varieties. A followup, post-emergence application of dicamba may be necessary when new seedlings have germinated following crop emergence.
Crops, Soybeans

Pest Patrol: Control of Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 2 minutes Q: Canada fleabane has shown up in various places on our farm this year. I assume it is glyphosate resistant. Do I have any other options for soybeans other than Xtend beans? A: Yes, research conducted by the University of Guelph (Ridgetown Campus) has shown that the addition of Eragon LQ (30 ml/acre) + Sencor […] Read more
Figure 1. Canada fleabane plants the following spring after surviving fall tillage. Note the plants have multiple branches at the base and were often 10 to15 cm taller than plants not exposed to fall tillage.
Cereals, Crops

Pest Patrol: What have we learned in 2017 for managing glyphosate-resistant Canada fleabane?

#PestPatrol with Mike Cowbrough, OMAFRA, Dr. Clarence Swanton, Dr. François Tardif and Peter Smith, University of Guelph

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Reading Time: 2 minutes Multiple strategies are needed to control glyphosate-resistant Canada fleabane. Experience has taught agronomists and farmers that simply tank mixing another mode of action won’t be a good enough long-term approach. Since 2016, we have evaluated different management tactics for Canada fleabane. The following are the results at our Oxford and Norfolk county field locations. Tillage […] Read more

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