August 11 day of treatment 
Applying Clear Cast 
Applying Clear Cast 
August 17 – 6 days after treatment
Despite mechanical harvesting to remove weeds in June, the water chestnut in the northern end of Coes is very thick, and extent/area covered seems to have expanded from last year. The city decided to use a chemical treatment rather than a second round of mechanical harvesting to try to control the invasive weed. On August 11 the herbicide Clear Cast was applied. The pictures show a portion of the weeds on the day of the treatment, the technicians applying the herbicide from air boats, and beginning to see impact of the herbicide on the water chestnut. The weeds are still clearly visible, but the color is changed from bright green to brown.
Tatnuck Brook Watershed Association 