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2020 Aquatic Plant Survey Results

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Survey Dates: The pre-treatment survey of Lake Zoar was conducted on June 18th. A second survey was conducted on July 27th, after the first herbicide treatment and prior to the second. The final survey was conducted on October 1st, following the second herbicide treatment. 

2020 Lake-Wide Results 

Eurasian milfoil, Brittle naiad, and Curly-leaf pondweed were the only invasive species found in Lake Zoar in 2020. 

Eurasian milfoil was abundant in June, but the density of the plant beds, on average, was only moderate. The frequency and density of the species was reduced in August and further reduced in October. 

Brittle naiad was not found in the lake in June and was very sparse in October. 

Curly-leaf pondweed was fairly abundant in June but had decreased notably by August and was very sparse in October. 

14 native aquatic plant species were found in Lake Zoar in 2020, along with filamentous algae and Lyngbya, which is a mat-forming cyanobacteria. 

Of the native species, Coontail (Ceratophyllum demersum), Tape grass (Vallisneria americana), and Water stargrass (Zosterella dubia) were typically the most dominant.”

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