On Aug. 4, 2017, a field crew from the Deep Creek Lake Management Office observed several small patches of hydrilla (Hydrilla verticillata) while conducting plant surveys in Arrowhead Cove. The patches ranged in size from 0.5 square meters to about 3-5 square meters in diameter at a water depth of roughly 3-5 feet. This is the first occurrence of hydrilla outside of the southern cove areas that have been treated to control hydrilla since 2014.
Due to the high boat traffic in this area, quick action has been recommended to minimize the chance that these patches will spread. The patches will be treated with a fast-acting contact herbicide on Wednesday, Aug. 9. Access to the cove will be limited very briefly while the applicator is conducting the treatment, but there are no water use restrictions once complete. A purple to rusty color may be visible in the water a day or two after treatment. This will dissipate with wind/wave action.
Intensive plant monitoring will take place post-treatment to ensure positive control. This area will be added to the 2018 hydrilla treatment program.