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Published byJob Strickland Modified over 9 years ago
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AQUATIC WEED CONTROL
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Ponds 14,000 ponds east of highway 17
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Ponds Two kinds of ponds Ones that have weeds Ones that will have weeds
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AQUATIC WEEDS Algae Photosynthesizing plant No roots, leaves, or flowers No roots, leaves, or flowers
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AQUATIC WEEDS Algae Microscopic algae: turns water green
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AQUATIC WEEDS Algae Filamentous: strands attach to rocks or float in mats
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AQUATIC WEEDS Algae Chara: resemble flowering plant Can be toxic to fish Can be toxic to fish
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AQUATIC WEEDS Flowering Plants Submersed Rooted plants that don't reach the surface Rooted plants that don't reach the surface
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AQUATIC WEEDS Flowering Plants Free-floating Floating plant that has dangling unattached roots Floating plant that has dangling unattached roots
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AQUATIC WEEDS Flowering Plants Free-floating Water Lettuce Water Lettuce
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AQUATIC WEEDS Flowering Plants Free-floating Water Hyacinth Water Hyacinth
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AQUATIC WEEDS Flowering Plants Free-floating Water Hyacinth
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AQUATIC WEEDS Flowering Plants Free-floating Duckweed Duckweed
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AQUATIC WEEDS Flowering Plants Rooted-floating Crested Floating Heart Crested Floating Heart
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AQUATIC WEEDS Flowering Plants Emergent Rooted and emerging above water surface Rooted and emerging above water surface
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AQUATIC WEED GROWTH LIGHT Photic zone is the water with enough light to support growth Bottom of photic zone is 1% of full sunlight Silt water = 3" Clear water as deep as 300'
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AQUATIC WEED GROWTH NUTRIENTS Nitrogen and phosphorus Phosphorus is the limiting nutrient Most important to free-floating plants Most important to free-floating plants P pollution can cause algal blooms Runoff is major contributor
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AQUATIC WEED CONTROL Nutrient control Buffer vegetation on shore Unmowed strip Unmowed strip
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Shoreline Turf will be undercut
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AQUATIC WEED CONTROL
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Nutrient control Buffer vegetation on shore Wetland plants Wetland plants
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Shoreline Vegetate shoreline Wetland plants Wetland plants Wetland carpetWetland carpet
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AQUATIC WEED CONTROL Nutrient control Floating wetland Dangling roots support microbes (biofilm) Dangling roots support microbes (biofilm) Absorb nutrients Absorb nutrients
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Shoreline Riprap shoreline Stones control emergent weeds
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AQUATIC WEED CONTROL Rip rap Stabilize shoreline
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AQUATIC WEED CONTROL Mechanical Weed cutters that remove weeds Slow 2 acres/day 2 acres/day
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AQUATIC WEED CONTROL Drawdown Solidify floating nutrients Kill submersed weeds
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AQUATIC WEED CONTROL Non-toxic blue dyes Blocks light below 2'
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AQUATIC WEED CONTROL Biological Alligatorweed Flea Beetle Release controlled alligatorweed where flea beetle can overwinter Release controlled alligatorweed where flea beetle can overwinter Water Hyacinth Mites, weevils and fungus released Mites, weevils and fungus released Limited success Limited success
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AQUATIC WEED CONTROL Aeration Fountains and turbines Aerobic conditions support microbes and fish Aerobic conditions support microbes and fish Reduce algae? Reduce algae?
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AQUATIC WEED CONTROL Grass carp Triploid (sterile) Consume massive amounts of algae and weeds Live 10 years
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AQUATIC WEED CONTROL Tilapia Feed on algae Harvest to eat
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AQUATIC WEED CONTROL Barley bales Releases natural chemical Green water only
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AQUATIC WEED CONTROL UV Filter Water passes by UV bulb Controls algae only Algal cells clump together or die
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AQUATIC WEED CONTROL Chemicals Some that are labeled for aquatic use Consult label Liquid, granule or pellet formulation Sinker adjuvant Sinker adjuvant
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AQUATIC HERBICIDES Copper Sulfate (Cutrine) Controls algae in drinking water supplies Alkaline water (high carbonates) precipitate out copper Copper Chelates more stable in alkaline water Copper Chelates more stable in alkaline water
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AQUATIC HEBRICIDES Emerged or floating weeds Diquat (Reward) Less effective in muddy water Less effective in muddy water 2,4-D (Aquacide) Glyphosate (Rodeo)
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AQUATIC HEBRICIDES HERBICIDE APPLICATIONS Start control early to avoid oxygen depletion Repeat other half after 2 weeks Repeat other half after 2 weeks
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Fish Kill MO decomposing plant material utilizes oxygen Heavy weed or algae kill can deplete oxygen from water and kill fish Control only 1/2 of area High temperatures have less oxygen More susceptible to fish kill More susceptible to fish kill
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AQUATIC HEBRICIDES Volume needed for algae and free floating weeds Acre-feet = surface area (acres) X average depth Average depth Half of maximum depth Half of maximum depthOR Average of several measurements Average of several measurements
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Kiawah 115 ponds 343 acres 49 miles of shoreline
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Kiawah Bivalves (clams) filtering capacities Attaching to grid to floating wetlands, sinking them Herbicide Bioaugmentation Tilapia and Grass Carp Cost about $19/A annually
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Aquatic Weed Database http://aquaplant.tamu.edu/ http://aquaplant.tamu.edu/
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