Latest articles


Pest Patrol: Controlling wild carrot in no till

#PestPatrol with Mike Cowbrough, OMAFRA

Q: I am a long-time no tiller. I have a problem with increasing populations of wild carrot, mostly in my (conventional) soybean fields. This year in Roundup Ready corn, I have applied up to three litres of Transorb 540 and still have green carrot at harvest-time. What is the solution? Do I need to do […] Read more


Pest Patrol: Dealing with jimsonweed

#PestPatrol with Mike Cowbrough, OMAFRA

Q: What weed is this, and how do I get rid of it? A: The weed in the picture (Figure 1 above) is jimsonweed (i.e. Datura stamonium), a member of the nightshade family. According to the Canadian Poisonous Plants Information System, jimsonweed “contains toxic tropane alkaloids, which have caused poisoning and death in humans and […] Read more




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

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



Pest Patrol: Chess moves on winter wheat crop

#PestPatrol with Mike Cowbrough, OMAFRA

[Question:] I had a weed called “chess” in my winter wheat crop at harvest. How did it get here? Is it a problem? And how do I get rid of it? [Answer:] How did it get here? Chess (scientifically known as Bromus secalinus) is also sometimes referred to as “cheat” or “rye brome.” It is […] Read more


Pest Patrol: Mixing ‘crop enhancer’ with glyphosate for weed control

#PestPatrol with Mike Cowbrough, OMAFRA

[Question:] I recently received this query. “I have a client who wants to mix a ‘crop enhancer’ with glyphosate to control weeds in glyphosate-tolerant soybeans. According to the manufacturer’s website, this product ‘can be combined with other applications (e.g. fertilizer, herbicides, insecticide, etc.).’ However, when I read the composition of the product, it appears to […] Read more



Pest Patrol: Keeping woodsorrel under control

#PestPatrol with Mike Cowbrough, OMAFRA

A grower I work with is seeing more woodsorrel in corn and soybean fields. I can’t seem to find much information on how to control this weed. Any suggestions? Common yellow woodsorrel, although very common in lawns, pastures and “waste” areas, is rarely found in field crops since tillage often eliminates it. Because of this, […] Read more


Pest Patrol: How effective is tillage at controlling glyphosate-resistant Canada fleabane?

#PestPatrol with Mike Cowbrough, OMAFRA

It’s a saying commonly used by advocates who would like to see more tillage used for weed control: “No herbicide resistance can evolve to cold hard steel.” I’m not here to discount the value of tillage for weed control, but this implies that tillage is foolproof. Although tillage can do a reasonably good job at […] Read more



Pest Patrol: How do I get better control of lamb’s quarters?

#PestPatrol with Mike Cowbrough, OMAFRA

Lamb’s quarters has consistently been identified as the most abundant and most problematic weed affecting field crop production in Ontario. Yet the Pest Management Regulatory Agency database contains hundreds of herbicides that list lamb’s quarters as either suppressed or controlled. It’s safe to say there is an arsenal of products available to farmers, but our […] Read more


Pest Patrol: Xtend soybeans, spray drift and controlling glyphosate-resistant fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

I want to plant Roundup Ready 2 Xtend soybeans this season to control my glyphosate-resistant Canada fleabane. But I keep hearing about the increased risk of drift with the dicamba-based herbicides. Is this fear mongering, or do I need to pay special attention when applying herbicides containing dicamba? We can learn a lot about the […] Read more