Lake Koronis, Stearns Co., Minnesota has been maintaining channels for navigation, which have been effective for reducing biomass. Re-growth of starry stonewort is still problematic so multiple trips with a mechanical harvester may be required throughout the growing season. Fragmentation can occur with both boats and a mechanical harvester, therefore; I still would recommend using a mechanical harvester to alleviate the problem areas. Feel free to contact me directly for further insights.
Aquatic Invasive Species Specialist | Invasive Species Program
Minnesota Department of Natural Resources
1035 South Benton Drive
Sauk Rapids, MN 56379