herbicide resistance – Aquarius-Systems

Herbicide Weed Resistance Battle Must be Fought at Different Levels

Tue, 20 Sep 2022 20:52:43 +0000

We realize this article is about terrestrial weeds, but can’t help but make the connection to aquatic plants and the need to have many options in the lake management plan.

When weeds begin showing resistance, it’s not a case of the herbicide changing the weed, it’s a simple “survival of the fittest” case, according to a Texas A&M AgriLife Extension Service specialist.

According to Scott Nolte, Ph.D., AgriLife Extension weed specialist, College Station, “You have to rotate the things that work, otherwise they eventually won’t work.”

Lake George Herbicide Use Raises Questions on Long-Term Impact

Fri, 01 Apr 2022 13:41:53 +0000

The Adirondack Park Agency (APA) is using an aquatic herbicide at two points along Lake George in New York State. At both sites, the problem is growth of Eurasian Watermilfoil, an invasive plant species that grows quickly in water bodies it’s tracked into.

The APA conducted monitoring and said the herbicide eliminated all traces of Eurasian Watermilfoil and found no significant impact on other plants, or degradation in wetlands. However, not every group tasked with caring for Lake George or the Adirondacks is convinced about ProcellaCOR EC yet. There isn’t enough long-term evidence of the herbicide’s safety. Some factors have to be measured over a lot of time.

In some cases, other states have made their own observations about the effectiveness of ProcellaCOR EC and the drawbacks that could manifest. From a document on the herbicide’s use by the Wisconsin Department of Natural Resources:

“It is important to note that repeated use of herbicides with the same mode of action can lead to herbicide-resistant plants, even in aquatic plants. Certain hybrid Eurasian watermilfoil genotypes have been documented to have reduced sensitivity to aquatic herbicides. In order to reduce the risk of developing resistant genotypes, avoid using the same type of herbicides year after year, and utilize effective, integrated pest management strategies as part of any long-term control program.”

Read More https://www.news10.com/news/north-country/inside-the-herbicide-that-may-see-use-in-lake-george/

Hybrid Milfoil in Michigan Lake Raises Control Challenges

Wed, 19 Jan 2022 18:58:26 +0000

Pentwater Lake Improvement Board President Joe Primozich recently issued an update on changes going on in overall health of Pentwater Lake in Michigan.

Primozich said according to Progressive AE, the Grand Rapids company that monitors the lake vegetation, the aquatic invasive water milfoil has now changed to the hybrid form.

“This means that it has a greater tolerance to herbicides and will require a more costly treatment than dealing with the native northern milfoil or the exotic Eurasian milfoil of the past 16 years,” Primozich said. “This appears to be a more aggressive growth pattern.”

Pentwater Lake shoreline owners (riparians) have petitioned the Pentwater Lake Improvement Board to substitute suction harvesting for the chemical treatment of floating vegetation mats for 2017. A presentation on mechanical harvesting will be held on December 14th.