Being able to spray weeds like redroot pigweed early without spraying an entire field could help reduce costs for farmers.

Canadian weed sensing project could mean targeted spraying

Pesticides sprayed with more precision could reduce farmer costs and build consumer confidence in products

Reading Time: 2 minutes Glacier FarmMedia – A project that will examine the use of artificial intelligence to detect weeds and crop pests during passes over a field received a $12.8 million investment from Protein Industries Canada. Led by Precision.ai., Sure Growth Solutions Inc., Exceed Grain Marketing and the Global Institute for Food Security, the project is designed to […] Read more

Canada thistle usually needs to be controlled by using multiple products.

Weed of the week: Canada thistle

Canada thistle has more than one way or reproducing, making it tougher to control

Reading Time: 2 minutes It takes more than one field action to control Canada thistle – a prolific weed with a couple tricks up its sleeve. Also called creeping thistle and field thistle, Canada thistle (Cirsium arvense) is a perennial weed that reproduces both by seed and by horizontal roots. Dense patches of new shoots can form from these […] Read more

Waterhemp is a cross-pollinating species, which improves its ability to develop herbicide resistance.

Weed of the week: Waterhemp

The challenging weed rapidly develops resistance, so rotating herbicides is critical

Reading Time: 2 minutes Waterhemp can be controlled through a variety of approaches, but identification is often difficult. The weed — a non-native member of the pigweed family first discovered in Lambton County in 2002 – is an annual plant producing tens of thousands of seeds every year. It features narrow leaves, wavy leaf margins, and (almost completely) hairless […] Read more

Herbicide-resistant redroot pigweed continues to spread.

Weed of the week: Redroot pigweed

Economic thresholds run from five to 15 plants per 10 metres of row

Reading Time: 2 minutes Redroot pigweed can be a tough customer. But don’t wallow in despair – control is possible. Redroot pigweed (Latin name Amaranthus retroflexus) is an annual weed found throughout Ontario in cultivated fields, gardens, pastures, waste places, roadsides and, according to the Ontario Ministry of Agriculture, Food and Rural Affairs, nearly any other disturbed area. While […] Read more

The new formulation aims to provide early season control of broadleaf weeds such as pigweed and many more.

NuFarm launches new Valtera liquid formulation herbicide

Reading Time: < 1 minute Growers in Eastern Canada have another option for early season control of broadleaf weeds in soybeans, wheat and corn. ValteraTM EZ is a pre-emergent herbicide from Nufarm Agriculture Inc. that is now available in a liquid formulation. “Valtera has been available in a dry formulation for several years in Canada delivering residual control for up […] Read more


Black-grass rising over and above a barley crop.

Using technology to pinpoint problem weeds

U.K. researchers create inexpensive, in-field herbicide resistance test tool

Reading Time: 3 minutes Britain’s island geography has been a major barrier for invading forces throughout history, but it’s not so effective at stopping the spread of invasive weeds. That’s why United Kingdom researchers have developed an inexpensive, convenient tool to help farmers identify resistant weeds, specifically black grass, as early as possible. Black-grass is to the U.K. what […] Read more

OMAFRA Weed Management Specialist Kristen Obeid is part of a team collecting leaf tissue from weeds in vegetable crops that could potentially possess resistance to herbicides.

Tracking down resistant weeds

Multiple herbicide-resistant weeds found in vegetable fields

Reading Time: 2 minutes Ontario Ministry of Agriculture, Food and Rural Affairs Weed Management Specialist Kristen Obeid is part of a team entering the fourth year of an initiative — funded through Agriculture and Agri-Food Canada — to genetically test weed samples from vegetable fields exhibiting herbicide resistance. Obeid is part of a team that has developed a process […] Read more

Bayer’s short season corn will only grow to about seven feet tall.

Bayer announces new herbicide mode of action

The broadleaf herbicide will be the first new mode of action in 30 years

Reading Time: 3 minutes A new herbicide molecule, a different approach to short stature corn and XtendFlex soybeans are three projects in the Bayer CropScience development pipeline that could have an impact on farms. Why it matters: There is increasing resistance to current herbicides so a new mode of action will be welcome. Bayer announced the new herbicide and […] Read more


Resistant waterhemp has been increasing its presence in southwestern Ontario.

Study shows multiple routes to herbicide resistance

Reading Time: 2 minutes A team including evolutionary biologists from the University of Toronto have identified the ways in which herbicide-resistant strains of invasive common waterhemp have emerged in fields of soy and corn in southwestern Ontario. They found that the resistance, which was first detected in Ontario in 2010, has spread thanks to two mechanisms: Pollen and seeds […] Read more

Kristin Obeid says more farmers need to take advantage of quick testing to improve weed management.

Leaf tissue testing helps to identify herbicide resistance

Two- to 10-day turn around for test results is much quicker than in the past

Reading Time: 2 minutes Resistant weeds continue to create problems across Ontario as horticulture growers have far fewer post-emergent herbicide products compared to cash crop growers. Why it matters: If growers have access to a quick, reliable test for herbicide resistance, they can develop control strategies sooner, and reduce the potential for the weeds to spread. Kristen Obeid, weed […] Read more