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Entries in northern watermilfoil (1)

Thursday
May182017

Milfoil Hybrid Could Cause Even More Problems for Northern Fisheries

Management of problematic aquatic vegetation could get even more difficult, especially in northern bass waters. Recent findings in Minnesota's Minnetonka and Christmas lakes lead researchers to theorize that a milfoil hybrid could be more invasive and tougher to control than the Eurasian variety.

The hybrid is a cross between Eurasian and northern watermilfoil, a native plant.

Using cutting-edge genetic screening techniques, scientists from the University of Minnesota and Montana State discovered that the hybrid was more prevalent in areas treated with herbicides than those with little management. The Minnehaha Creek Watershed District (MCWD) said that herbicides might actually promote hybrid growth "and some hybrids may show greater tolerance to treatment."

Additionally, MCWD's Eric Fieldseth said, "As a pilot study, this research gets the ball rolling on understanding hybrid watermilfoil, its impact, and how it can better be controlled. These findings are an important first step toward developing more effective milfoil management strategies."

Researchers also found multiple, genetically distinct genotypes of invasive, hybrid, and native watermilfoil. That underscores the need for understanding the genetic makeup of invasive plants in a fishery before devising a plan to manage them and then following up with more genetic screening to guide future management, MCWD explained.

"With this much diversity in the population, a successful milfoil management strategy may not be a 'one size fits all' approach," added, Ryan Thum, professor of plant sciences and plant pathology at Montana State.

"We're looking forward to seeing how these results compare with what's happening in other parts of the region," he said. "This research could have broad implications for managing milfoil in lakes throughout the Upper Midwest and beyond."