2008 was a benchmark year for EWM management in Vilas County. For the first time ever, 17 area water bodies were subjected to aggressive chemical control programs, all with WDNR approved plant management plans and with State funding covering as much as 75% of the costs for:
· Pre and post treatment assessment of the aquatic plant communities (performed by professional consultants)
· Pre-treatment mapping
· Permitting fees
· Placement of the chemicals by a licensed applicator
Conditions at the time of all chemical applications were ideal; water temperatures on treated lakes was at or below 62 degrees Fahrenheit and winds were light to calm. The chemical applicator used high tech electronic distribution equipment enabling precise control of both placement and concentration of the chemicals.
Evaluation of the effectiveness of the treatments will occur on all lakes during the balance of this summer. The results for each lake will be considered when planning ongoing management for 2009.
The results of the current post treatment measurement of chemical residue in the water and sediment at specific sites on the Eagle River chain will also be considered for future county-wide planning. The results of that study will not be known until later this year.
The following statistics reflect the county-wide 2008 chemical control program.:
Total water bodies chemically treated: 17 (11 Eagle River Chain, 6 non-chain lakes)
Total acres chemically treated: 452 (195 Eagle River Chain, 257 non-chain lakes)
Total gallons liquid 2,4-D applied: 1,025 (0 Eagle River Chain, 1,025 Big Sand Lake)
Total pounds granular 2,4-D (Navigate brand) applied: 47,520 (25,550 Eagle River Chain, 21,970 non-chain lakes)
NOTE: Navigate brand 2,4-D is 73.3% by weight inactive ingredient and 26.7% 2,4-D. Therefore, of the 47,520 pounds of Navigate applied county-wide, only 12,688 pounds was active ingredient.
Additional information and links to maps showing specific treatment sites for each lake can be found on the EWM page of the AIS Partnership website at: http://vilaslandandwater.org/ais_pages/ais_species_ewm_page.htm#2008chemicalcontrol