Late last summer COLA’s Aquatic Invasive Species (AIS) contractor identified and documented the location of all known AIS in the LCO lakes. The two invasive species of concern are Curly-leaf Pondweed (CLP) and Eurasian Watermilfoil (EWM) (more). Five locations have been identified that are too large or the plants so dense that herbicide treatment is the only feasible option to manage the growth or spread at these locations. Please view the five location maps here to determine the location and AIS species that are within 150’ of your property.
COLA has applied for a WDNR permit and large-scale worksheet to allow COLA’s AIS Contractor to apply herbicide at the five locations beginning with the CLP locations in mid-May and the EWM locations in mid to late June. The COLA contractor will be using the herbicide Aquathol-K active ingredient Endothall at the three CLP locations and Weedar-64 active ingredient 2,4-D at the two EWM locations.
For the CLP locations the Aquathol-K post treatment water use restrictions within 150 feet are:
· SWIMMING NO RESTRICTIONS
· FISHING OR FISH CONSUMPTION NO RESTRICTIONS
· WATER GRASS NO RESTRICTIONS
· GARDEN CROPS, NEW SEED, or ORNAMENTALS no watering for 7 days
For the EWM locations the Weedar 64 post treatment water use restrictions within 150 feet are:
· SWIMMING NO RESTRICTIONS
· FISHING OR FISH CONSUMPTION NO RESTRICTIONS
· WATER GRASS NO RESTRICTIONS
· GARDEN CROPS OR ORNAMENTALS no watering for 21 days
COLA is hopeful that by treating the five locations with herbicide this season we will reduce the areal extent and density at each location, reduce the risk of spreading CLP and EWM to other part of the lake(s) and be in good position in 2021 to deploy the Eco-Harvester, an effective method of non-herbicidal control for AIS on the LCO lakes.