What effect will extreme cold temperatures have on early-season weed control? That’s a question University of Guelph, Ridgetown College weed scientist Dr. Peter Sikkema has been hearing a lot lately. With farm fields across Ontario being punished by extreme cold temperatures that have dropped to nighttime lows of minus 5 degrees C, many growers are… Read More
Tag: Dr. Peter Sikkema
For people who play the stock market, an opportunity to cash in on an 826 per cent return on investment doesn’t come along too often. But Ontario farmers can realize this type of return every time they apply herbicide in corn fields that experience intense weed pressure, says University of Guelph weed scientist Dr. Peter… Read More
Herbicide resistance is nothing new to Ontario farmers. It all started in 1973 when triazine-resistant lamb’s-quarters were found on a farm near Ripley, Ontario. Group 2 herbicide-resistant weeds were first documented in 1996. Fast forward to 2018, and we find that the province is now home to a host of glyphosate-resistant weeds including Canada fleabane, giant… Read More
It’s not necessarily the happiest of discoveries, but it’s a first-of-its-kind discovery, nonetheless. Work out of the University of Guelph has confirmed Group 14 resistance in waterhemp at multiple locations in Ontario. What’s more, Dr. Peter Sikkema’s research team, including graduate student Lauren Benoit, has also confirmed waterhemp with cross-resistance to Groups 2, 5, and… Read More
If you’ve noticed more than a few fleabane “escapes” in recent years, you’re not alone. Glyphosate resistant Canada fleabane has spread across more than 700 kilometers of Ontario crop land in just five years. Despite its incredible distribution, Canada fleabane wasn’t the first glyphosate resistant weed found in Ontario, says Dr. Peter Sikkema, field crop… Read More