A few more odds and ends from yesterday’s sauna (silver lining: down 3 pounds in a day!)
When purple loosestrife gets in gear, as it has here at Deep Hollow, it’s not pretty. Way too aggressive. What you can do:
People spread purple loosestrife primarily through the movement of water-related equipment and uninformed release of garden plants. The plant produces millions of tiny seeds in shoreland areas. Seeds can be hidden in mud and debris, and can stick to boots, waders, and other fishing and …hunting gear. Roadside maintenance equipment can also spread this plant and its seeds.
Whether or not a lake is listed as infested, Minnesota law requires water recreationists to:
•Clean watercraft of all aquatic plants and prohibited invasive species.
•Drain all water by removing drain plugs and keeping them out during transport.
•Dispose of unwanted bait in the trash.
•Dry docks, lifts, swim rafts and other equipment for at least 21 days before placing equipment into another water body.
Follow the “Play, Clean, Go” best management practices to prevent the spread through terrestrial systems.
Report new occurrences of purple loosestrife to the DNR immediately by contacting your DNR Invasive Species Specialist or log in and submit a report through EDDMapS Midwest .
Management of invasive aquatic plants involving either mechanical removal of plants or application of herbicides to public waters requires a permit from the DNR. Talk to a DNR specialist for more information.
Mechanical control can be done using hand-held equipment like a shovel or weed puller, but is labor intensive for large stands. Hand removal is recommended when dealing with individual plants or very small stands. Mowing is not recommended as plants will likely re-sprout and seeds may be spread.
Herbicide control can be done using glyphosate herbicides. An aquatic herbicide formulation is required if treatment is to be conducted on or near water.
Biological control can be done using four species of beetles which are well-established biological control agents in Minnesota. These beetles solely eat purple loosestrife, and are a good control option if the stand of purple loosestrife is at least one acre in size or larger. Biological control insects released between 1992 and 2002 have established reproducing populations at more than 90% of the release sites visited. The long-term objective of biological control is to reduce the abundance of purple loosestrife in wetland habitats and, if effective, will reduce its impacts on native wetland flora and fauna. Talk to your local invasive species specialist if you are interested in collecting and releasing beetles at a site. The best time to collect beetles for biological control is in late May or early June.