Gregory J. Bugbee Connecticut Agricultural Experiment Station Department of Environmental Sciences Invasive Aquatic Plant Program

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1 Gregory J. Bugbee Connecticut Agricultural Experiment Station Department of Environmental Sciences Invasive Aquatic Plant Program

2 Connecticut s Invasive or Potentially Invasive Aquatic Plants CT State Statutes (Sec. 22a-381d) # COMMON NAME SCIENTIFIC NAME DISPERSAL 1 American water lotus Nelumbo lutea Water Gardening 2 Brazilian water-weed, Anacharis, Egeria Egeria densa Aquariums, Boats/Trailers, Bait 3 Brittle water-nymph, Minor naiad Najas minor Boats/Trailers 4 Common water-hyacinth* Eichhornia crassipes Water Gardening 5 Curly leaf pondweed, Crispy-leaved pondweed Potamogeton crispus Boats/Trailers 6 Eurasian watermilfoil Myriophyllum spicatum Aquariums, Boats/Trailers, Bait 7 European waterclover, Water shamrock Marsilea quadrifolia Water Gardening, Boats/Trailers 8 Fanwort Cabomba caroliniana Aquariums, Boats/Trailers 9 Flowering rush Butomus umbellatus Water Gardening 10 Forget-me-not, Water scorpion-grass Myosotis scorpioides Water Gardening 11 Giant salvinia Salvinia molesta Water Gardening 12 Hydrilla Hydrilla verticillata Aquariums, Boats/Trailers, Bait 13 Onerow yellowcress Rorippa microphylla Water Gardening 14 Parrotfeather Myriophyllum aquaticum Water Gardening, Boats/Trailers 15 Pond water-starwort Callitriche stagnalis Water Gardening 16 Purple loosestrife Lythrum salicaria Nursery Stock, Water Gardening 17 Variable-leaf watermilfoil Myriophyllum heterophyllum Aquariums, Boats/Trailers 18 Water chestnut Trapa natans Water Gardening, Boats/Trailers 19 Water lettuce, American water lotus* Pistia stratiotes Water Gardening 20 Watercress Rorippa nasturtium-aquaticum Water Gardening 21 Yellow floating heart Nymphoides peltata Water Gardening 22 Yellow iris, Yellow flag iris Iris pseudacorus Nursery Stock, Water Gardening *plants that are not banned

3 Early Detection Cabomba found in Bashan Lake Fall 2010 and Rapid Response Suction Harvesting CAES IAPP 3/5/2014

4 Eurasian Watermilfoil in Candlewood Lake

5 Curlyleaf Pondweed in Crystal Lake, Middletown CT

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7 CAES IAPP Website

8 Prevention CAES IAPP Lake Quonnipaug 06/14/2001

9 Stores Selling Banned Aquatic Plants Year Stores Visited Banned Plants Fanwort Brazilian Waterweed Parrot Feather Variable Milfoil Unidentified Milfoil (29%) 4 (14%) 4 (14%) 2 (9%) 0 NA (30%) 11 (23%) 5 (11%) 1 (2%) 1 (2%) 6 (13%) Revisited all stores in 2011 and handed out information on laws and I.D. Revisited most violating stores in Approx. 80% in compliance. CAES IAPP 1/28/2014

10

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12 What Makes a Successful Drawdown Temperature Air Sediment Vegetation Plant susceptibility Duration Drying Freezing Snow, ice cover etc.

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14 Connecticut Public Act No Effective January No person shall apply any fertilizer that contains phosphate to an established lawn. 2. No person shall apply any fertilizer that contains phosphate to any lawn from November 15 th to April 1 st. 3. No person shall apply any fertilizer that contains phosphate to any lawn that is located 20 feet or less from any body of water. 4. Fertilizer may be applied to established lawns if suggested by a soil test.

15 Will Phosphorus Limit Invasive Aquatic Plants? Science, 11/28/2008

16 Harvesting Pros Immediate Biomass is removed Selective to area Cons Labor intensive Rapid regrowth Often expensive Invasives on harvesters Fragmentation

17 Drawdown Pros Little cost Shoreline protection Reasonably effective Cons Weather dependent Non-target plant issues Aquatic organism issues Nutrient release Refill time

18 Herbicides Pros Quick Acting Targetable Viewed as panacea Reasonably effective Cons Controversial Not a silver bullet Cost Water use restrictions Refill time

19 Aquatic Herbicides Product Action Selectivity Treatment Cost (approx.) Reward (Diquat) Contact Little Spot $300 Navigate (2,4-D) Sonar AS (Fluridone) Clipper (Flumioxazin) Systemic Highly Spot $800 Systemic Moderate Whole Lake 500 Contact Little Spot $800

20 September fish per acre Grass Carp 20 acres Grannis Lake East Haven CT Screen with ¾ openings

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22 Introduction of Milfoil Weevils into Candlewood Lake

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24 Questions? Gregory J. Bugbee (203) The Connecticut Agricultural Experiment Station Invasive Aquatic Plant Program 123 Huntington St. P.O. Box 1106 New Haven, CT

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