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
Tag Archives herbicide resistance — page 3
Study shows multiple routes to herbicide resistance
Leaf tissue testing helps to identify herbicide resistance
Two- to 10-day turn around for test results is much quicker than in the past
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
New option launched to manage resistant weeds in soybeans
Enlist E3 soybeans are resistant to multiple herbicides meaning more options to deal with weed issues
Ontario farmers will have more options to manage herbicide-resistant weeds with the launch of Enlist E3 soybeans in Canada. E3 soybeans are resistant to 2,4-D, glyphosate and glufosinate herbicides. That provides more flexibility when spraying fields that have resistant weeds, which are becoming an increasing problem in Ontario, especially when it comes to glyphosate. Why […] Read more
Glyphosate resistant waterhemp moving across Ontario
With its method of pollination and resistance abilities, the weed is becoming harder to control
Glyphosate-resistant waterhemp is now present in seven counties across Ontario. Huron, Wentworth and Haldimand are the three most recent counties where it was found, in addition to the previous Essex, Lambton, Chatham-Kent and Middlesex counties. Seeds were harvested harvested in fields in these counties last fall, planted in a greenhouse to overwinter and tested once […] Read more
How weeds outsmart you
Herbicide resistant weeds proliferate in unexpected ways, making scouting more important than ever
For two scorching-hot days in July, farmers and crop consultants attending the University of Guelph’s Diagnostic Days event at Ridgetown College heard about the birds and bees – of herbicide resistant weeds. A session hosted by Dave Bilyea, research technician at the Ridgetown campus, reviewed the state of herbicide resistance in Ontario and across North […] Read more
Weedy conversations
A new inexpensive tool has emerged in the fight against weed resistance
In a newly released study, scientists at the University of Illinois and USDA’s Agricultural Research Service offer a new tool to fight herbicide resistant weeds that is not only highly effective, it’s free. All it costs is a conversation. Waterhemp, a weedy nemesis of corn and soybean farmers, has developed resistance to multiple herbicide modes […] Read more
Minnesota probes Palmer amaranth’s sudden appearance
Chicago | Reuters — Minnesota has launched an investigation to find the source of seed mixes contaminated with weed seeds after the aggressive, herbicide-resistant Palmer amaranth weed was found on 30 areas planted in a federal conservation program. The weed grows very fast, reaching up to eight feet in height and can hold back commercial […] Read more
EPA approves Monsanto’s dicamba weed killer
U.S. seeds and agrochemicals maker Monsanto Co. has secured approval from the U.S. Environmental Protection Agency for a new dicamba-based weed killer designed for its next generation biotech soy and cotton varieties, the company said on Wednesday. While approval had been expected, it is seen as a major step forward for the company’s newest herbicide […] Read more
No time like now to scout for resistance: CCC
Grain and oilseed growers making weekend plans are advised that herbicide-resistant weeds have way fewer places to hide right now. Any weeds that lived through pre-seeding burnoff or post-emergent spraying — where other weeds have clearly died — are best caught early, the Canola Council of Canada said in a release Friday. “It takes 14-21 […] Read more
U.S. EPA to require weed-resistance restrictions on glyphosate
Reuters — U.S. regulators will put new restrictions on the world’s most widely used herbicide to help address the rapid expansion of weeds resistant to the chemical, Reuters has learned. The U.S. Environmental Protection Agency (EPA) confirmed it will require a weed resistance management plan for glyphosate, the key ingredient in Monsanto’s immensely popular Roundup […] Read more
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