""It's more places than people want to admit," says Syngenta agronomist Stephanie Divitaris, pointing to fields in her southwestern Ontario territory last year where waterhemp escaped control and grew above the crop canopy."
"Research from University of Guelph weed scientist Dr. Peter Sikkema shows that the average yield impact of waterhemp is 43 percent, with losses of up to 100 percent in highly competitive environments."
"Bayer Crop Science technical product lead Adam Pfeffer says that when it comes to weeds, Palmer amaranth is considered 'the devil, but waterhemp is just as bad.'"
"Pioneer agronomist John Seliga emphasized that waterhemp remains the bigger day-to-day challenge. He notes that effective management programs for waterhemp will also control Palmer amaranth in most cases."
Waterhemp and Palmer amaranth are increasingly concerning for Ontario farmers as they spread across the region. Waterhemp has established itself in southwestern Ontario, particularly in Essex County and Chatham-Kent, with significant yield impacts reported. Research indicates average yield losses of 43 percent due to waterhemp, with potential losses reaching 100 percent in competitive environments. Palmer amaranth, newly identified in Ontario, is also aggressive and competitive. Effective management of waterhemp can help control Palmer amaranth, but reliance on post-emergence herbicides remains a challenge.
Read at Realagriculture
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