Eurasian Water Milfoil Treatment in a Isolated Illinois River Floodplain Wetland Tharran Hobson, The Nature Conservancy and Wayne Herndon, Illinois Department of Natural Resources - PowerPoint PPT Presentation

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Eurasian Water Milfoil Treatment in a Isolated Illinois River Floodplain Wetland Tharran Hobson, The Nature Conservancy and Wayne Herndon, Illinois Department of Natural Resources

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Title: Eurasian Water Milfoil Treatment in a Isolated Illinois River Floodplain Wetland Tharran Hobson, The Nature Conservancy and Wayne Herndon, Illinois Department of Natural Resources


1
Eurasian Water Milfoil Treatment in a Isolated
Illinois River Floodplain WetlandTharran Hobson,
The Nature Conservancy and Wayne Herndon,
Illinois Department of Natural Resources
Above and below Eurasian water milfoil
threatened the diversity of restored wetland
communities within the Merwin Preserve at Spunky
Bottoms.
USDA
Close up of Eurasian water milfoil, an aggressive
submerged aquatic exotic.
Map above showing spread of the exotic invader
over a short period of time.
Waterfowl were most likely a vector for the
exotic plant.
During fall 2004 staff discovered a small one
acre size population of exotic Eurasian
water-milfoil (Myriophyllum spicatum) growing in
a shallow water section of wetland on the
preserve. Given the aggressive nature of this
invader, plans were made over the winter to begin
treatment before the next growing season.
Through consultation with IDNR Fisheries
Biologist Wayne Herndon a treatment schedule was
developed to begin in May 2005. IDNR has made
trials and had success with aquatic herbicide
applications for the control of milfoil at sites
around the state. Dow Chemicals DMA-4 IVM, a
liquid formulation of the dimethylamine salt of
2,4-D was chosen due to success Herndon had
experienced and safety of the product.
Concentrations of between .5 and 1 part per
million active product ingredient in the water
column was the goal to eradicate milfoil without
harming desired native submerged vegetation.
Formulas were used to determine the total
acre-feet of water present in the 600 acre
wetland and further calculations broke total
gallons down into pounds of water present. Based
on this, it was determined exactly how many
gallons of product to use to achieve the desired
.5-1 part-per-million active ingredient
concentration. By application time in late May
it was estimated the small population had grown
to cover nearly 100 acres. DMA-4 IVM was applied
using a boat bailer to draw the product from a
boat mounted container. The entire water body
was treated using a grid pattern to evenly
distribute the herbicide via the motor prop wash.
Follow up monitoring one month post application
showed encouraging evidence that the exotic
milfoil was in advanced decline while native
coontail, elodea, and potamagetons appeared
unharmed. Further inspections later in the
season revealed no apparent live water milfoil
specimens anywhere within the water body. Staff
plans to monitor the wetlands at least twice
yearly for early detection of re-infestations.
It may not be possible to totally eliminate the
robust exotic and there is always a chance
waterfowl, the suspected initial vector, may
introduce new populations in the future. To
determine how much product was necessary the
following information was needed Determine the
acre-feet of water present. Based on contour maps
it was determined the water area was 600
acres. Using the same contours the average depth
was estimated at 2 feet. The total acre-feet of
water present was 1,200 (600 x 2).
Determine the weight of the water present. One
acre foot of water contains 326,000 gallons. One
gallon of water weighs 8.3 pounds. One acre-foot
of water weighs 2,705,800 lbs. (326,000 x
8.3). 1,200 acre-feet of water weighs
3,246,960,000 lbs. (1,200 x 2,705,800) Determine
the amount of product to use to reach a 1
part-per-million concentration of active
ingredient of herbicide in the water column.
DMA-4 IVM has 4 pounds active ingredient per
gallon. 80 gallons of DMA-4 is equal to 320 lbs.
active ingredient (4 x 80). 320 lbs. active
ingredient in the total amount of water present
is a concentration of less than 1 part per
million (320 / 3,246,960,000 .98
parts-per-million).
The method of product dispersal
The product we chose to use was Dows DMA-4 IVM
an approved aquatic version of 2-4D.
One month after treatment On the left is
milfoil beginning to die back. On the right is
native coontail and elodea clearly unharmed.
Venturi effect acted to pull product from a boat
mounted tank through the motor mounted bailer.
Operating the boat along a grid pattern evenly
distributed product throughout the water body.
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